Questions tagged [human-biology]

This tag is for questions about the general biological features of human beings (as opposed to the biology of non-humans).

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What kind of damage could a physical impact to the throat cause? [closed]

My friend got kicked in the throat, they currently have difficulties talking and finds it painful to eat. I'm wondering if they got the worst of possibilities or whether things could have been worse. ...
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If a chunk of your shoulder was removed would it heal completely? [closed]

If the human shoulder was damaged to where it has a small chunk of it's mass gone, would the wound eventually fully regenerate over time or just heal over the missing muscle with skin?
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Male lions kill existing cubs when taking over a pride. Wouldn't it make sense for human males to do the same? [closed]

Male lions kill existing cubs when taking over a pride. Wouldn't it make sense for human males to do the same? Both species are apex predators so generally, no other animal can kill the offspring and ...
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Why does the friction of the sexual organs cause ejaculation?

What is the physiological mechanism?What kind of physiological phenomenon can friction cause? Why does friction produce orgasm and generate electric current in the body?
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1answer
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Why do colors clash in your brain?

Wen pairing two or more colors together, some "clash" or cause a effect visually where the two colors meet. To me it appears to be a black line between the colors or shading when in fact ...
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Why/How can Hydrophobic things pass the lipid bilayer? [duplicate]

I’m just looking for a simple answer for this question. I’m in Bio 10, and don’t know the in depth stuff. So the lipid bilayer is hydrophilic and the ends, but hydrophobic in the middle; so how can ...
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Do Hydrolysis Reactions and Dehydration Reactions both Require ATP energy?

I’m just looking for a simple answer for this question. I’m in Bio 10, and don’t know the in depth stuff. I think both the reactions do require ATP Energy, because for a dehydration reaction, in order ...
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42 views

Eye vision for distant large objects versus small close objects

We often hear that looking at distant objects after staring at screens is good for the eyes to prevent strain. But from the perspective of eye muscles, what is the difference between small font that ...
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1answer
57 views

Why can't I swallow the entire (liquid) contents of my mouth at once?

I've tested this out using water - I manage to fit a certain amount of water in my mouth, but if I try to gulp it all at once, I fail: I feel like spitting the water out (gag reflex?) There's a ...
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What is the reason of symptoms like headache and coma in patients of metabolic acidosis?

Is the headache due to excess amount of acid and coma when the brain becomes too much fatigued coz of chronic low pH or the reason is something else?
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1answer
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What are proliferating, but “normal” (non-cancer, non stem) cells of the human (mouse)?

What are proliferating, but "normal" (not cancer, not stem, not differentiating) cells of the human (mouse) ? Typically after differentiation process finished the cells stop proliferation. ...
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2answers
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Is it possible for someone to be of no race? [duplicate]

I apologize if this is not the right forum to ask this question, but I don't know of any better forum to ask it. It is certainly possible for someone to have no religion, but is it possible to be of ...
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Why does (insulin induced) hypoglycemia stimulate ADH secretion?

Intuitively, I understand that ADH (Anti Diuretic Hormone) is responsible for maintaining osmolarity, and increased serum osmolarity is a stimulatory factor for its release. (ADH increases water ...
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Does Vasa deferens produce any secretion in the Human Body?

I got this doubt while attempting the following question: ...
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1answer
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colocalization by IFA?

I have done IFA (immunofluorescence assay) previously but i targeted only one protein or i tagged my endogenous protein with GFP/RFP then i performed IFA. I want to do the IFA in parental cell line (...
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1answer
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What is the best method to check for differential gene expression in large dataset? I want to identify aging differentially expressed genes

My data is RNAseq data and I want to know which all genes (which I am looking for) are differentially expressed with age. I have tried the Kruskal-Wallis test and fold change methods. Do you have any ...
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Exclusion and inclusion criteria for healthy controls in colorectal cancer study

I'm working on colorectal cancer, and I'm facing a problem in the sampling step, I can't figure out how to choose healthy subjects. In the literature, I've found many criteria that are different and ...
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What are evolutionary reasons for humans' limited regeneration abilities? [duplicate]

As far as I understand (I am not a biologist), a ability of a species arises during the evolution if: It increases reproduction chances It is not too energy expensive It is physically possible At ...
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1answer
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How much light can pass through the human eyelid?

My sister tells me that at night when the lights in the room are off that she can see the ambient outdoor light from neighboring buildigns and streetlights through her eyelids (i.e., when her eyes are ...
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1answer
126 views

How many senses do humans have?

I recall learning that humans have 5 senses, but that may have been an over-simplification to focus on the most notable ones, or simply that no others were known about at the time. Wikipedia says: ...
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1answer
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How do you determine “in which direction” DNA is shared between groups of people

In popular DNA ancestry tests you can read lines like "you have 2% neanderthal dna" or "you have 20% italian". How can you distinguish between a person having 20% italian vs ...
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1answer
74 views

Why is only the donor's antigen seen during a blood transfusion?

I am a high school student and I am a little confused that why only donor's antigen matters during blood transfusion? for e.g if the donor's blood is O- so it means that it will antibodies against all ...
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1answer
53 views

Why is the chordate nerve cord described as hollow when it appears to be solid?

My textbook says arthropods have a double, ventral, solid nerve cord. And chordates have a single, dorsal, hollow nerve cord. What is hollow exactly in a cord that looks like this?
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If excess sodium is bad for humans, why don't our bodies just remove it?

This is one of those questions where I realized two everyday facts don't connect for me. Excessive sodium in the diet is supposed to be bad for us. But surely our bodies have mechanisms for getting ...
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1answer
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Can any gas other than nitrogen cause decompression sickness (the bends)?

I know that our bodies use most of the oxygen we breathe in during a dive but, wouldn't our tissues, under pressure, absorb more oxygen than we need? For instance, in normal circumstances, we don't ...
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1answer
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How is the renal osmotic gradient maintained even though the blood osmolarity changes?

I am a high school student and I am a little confused in 2 things related to our urinary system: We know in our kidneys a countercurrent mechanism exists due to which there is a steep gradient of ...
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1answer
143 views

Do people need nitrogen from air for health?

Can people breath totally nitrogen-free atmosphere for a long time? I know, nitrogen is essential for life, and in big quantities, but maybe people can take it entirely from food, from proteins, etc?
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1answer
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Is covid vaccine helpful for a covid patient?

I am not a biology student and this question came in my mind out of nowhere. I read somewhere that the vaccines contain some denatured or almost dead corona viruses and when these are injected in our ...
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1answer
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What exactly makes red meat (probably) unhealthy?

It seems generally agreed that (even fresh, unprocessed) red meat is at least somewhat bad for human health. But why exactly is this the case? It's difficult to find any attempt at an explanation, ...
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1answer
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If a person touched an electric eel, would they sustain electrical burns as if they touched a high tension power line?

I've been wondering this, if an eel was continuously shocking someone, would they sustain electrical burns as if they touched a high tension power line due to the high voltage and amps?
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Effects of a constant magnetic field on the human body (especially blood circulation and ion channels)? [duplicate]

Recently, while searching for the safety of MRI, I read in several places that hemoglobin and iron in the blood are not significantly affected by magnetic fields, so MRI is safe. However, since the ...
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1answer
39 views

Do phagocytes need antibodies to be able to engulf pathogens (to function)?

I recently saw a question about monoclonal antibodies, that are specific to a certain virus, being split (into their constant and variable regions via an enzyme), and the question asked whether some ...
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2answers
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Why is haemophilia unviable in later stages of life?

A sentence in my textbook is: The possibility of female being haemophilic is extremely rare because mother of such a female has to be at least carrier and the father should be haemophilic (unviable ...
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Quantitative comparison of rate of energy output when burning carbs compared to fat

I'm studying scientific models of endurance exercise such as the one in a paper by Rapoport (see references below, popularization here). If I'm understanding properly, fat burning is in some sense ...
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1answer
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I hit an area of my elbow and had a burning sensation throughout my hand

I happened to bump the side of my right-hand elbow on a corner and suddenly felt a burning sensation on the right side of the hand elbow-up. Any theories that could describe what I recite?
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1answer
63 views

If massive animals live longer, why do humans with gigantism die younger?

What I mean is humans suffering from gigantism (type 1 neurofibromatosis, Marfan syndrome, X-linked dominant acro-gigantism, et cetera) rarely live more than 5 decades (50 years). The same can be said ...
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Is protein intake required for the formation of new myosatellite cells?

Hypertrophy of muscle fibers requires an adequate (significant, really) intake of protein, but what about just forming new myosatellite cells as a response to a stress applied to the muscle? Does that ...
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1answer
57 views

Check simple human fetus answers

Based on this image and questions, could someone please check my answers? Question 1: At which one of the following points will the blood passing the point be more oxygenated after birth than before ...
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Are there epigenetic effects in the regulation of human height?

Development of human average height Human average height has fluctuated significantly throughout history. For instance, in the last 100 years or so, it has increased sharply by about 10cm. OWID (Our ...
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1answer
71 views

The Relationship between Copper and Alzheimer's Disease

I've been reading up about the research concerning the etiological factors behind Alzheimer's and I came across two papers - "Studies on Copper induced stability changes in DNA fragment (GCA ATC ...
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1answer
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How many cells need to be damaged before a human can feel it as pain?

I'm guessing the answer to this question is rather large. Skin cells die all the time, it seems, and that never registers as painful. But suppose you rupture or otherwise destroy a group of cells, say ...
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1answer
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Can we decode memories?

Premise: I don't have a strong background in neuroscience or human biology, so I would ask you to answer like you would at a 5 years old child. I have done a couple of research on the web, as well as ...
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1answer
19 views

How does the shoulder joint stay in place?

I read that a human shoulder is a ball and socket joint, but when looking at a picture of a shoulder the socket part seemed way too small to hold the ball in place like a ball and socket joint. ...
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1answer
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Which landmark paper first described the differentiation of T-cells?

T-cells are distinguished from B cells in part by their locus of differentiation/maturation (thymus). This is textbook knowledge, but I was wondering which particular person or people were responsible ...
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1answer
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Why is gyrification advantageous?

Standard 'Explanation': I've seen countless neuroscience articles and experts explain that 'cortical gyrification is advantageous because it increases surface area which obviously increases your ...
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1answer
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Why does high blood pressure not damage the body during exercise?

Exercise is commonly understood to lower blood pressure by making the heart stronger. Mayo Clinic says, Regular physical activity makes your heart stronger. A stronger heart can pump more blood with ...
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1answer
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Why does the thickness of the Loop of Henle have to be less than the convoluted proximal tube and the distal convoluted tube?

We are currently being taught "Homeostasis through excretory system" in college. After seeing the structure of a nephron, it is not quite evident as to why should the Loop of Henle be the ...
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1answer
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If you only ate fruits, vegetables or smoothies would you be able to skip drinking water?

If you only ate fruits, vegetables or smoothies would you be able to skip drinking water? I do not see some animals (like squirrels) drinking water daily (doesn't mean they don't have a water source) ...
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1answer
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What type of epithelium are the pancreatic Islets of Langerhans?

The human pancreas contains exocrine acinus cells (simple cuboidal epithelium) and Islets of Langerhans. Despite looking online I cannot identify what type of epithelium the Islets of Langerhans ...
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1answer
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Why do we use mice in labs? [closed]

Why do we use mice in labs for experiments targeting humans ? Are they near humans biologically speaking ?

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