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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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1answer
47 views

How does vasodilation slow blood flow?

During inflammation, cytokines and histamine cause vasodilation to increase blood flow to the inflamed area. However, it is also said that vasodilation slows blood flow which facilitates the adhesion ...
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2answers
112 views

Does eating beans of a mother cause flatulence on babies?

Is it true that if you eat beans it could cause flatulence on babies (when breastfeeding them)? I can't find any research or scientific facts about that topic. I thought the body of the mother would ...
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0answers
23 views

What does the concept of information mean in biology? [closed]

We use a lot of borrowed analogies from other sciences; linguistics, computational sciences but what do we really mean, mean with information in living systems?
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1answer
46 views

Are modern gene-editing techniques capable of creating genetically-superior versions of humans? [closed]

Can we alter the DNA in, say, a small-framed, low muscle mass male to those of elite bodybuilders? Can we alter the DNA sequence that stops balding and hair loss? How about the genes responsible for ...
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2answers
51 views

How are we able to selectively inflate our cheeks?

First an observation - I noticed that I can not inflate my cheeks with my mouth open. This means that inflating cheeks is not a muscle property and that only pressure of air from lungs trapped inside ...
2
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1answer
41 views

Why is free ribose not reduced to deoxyribose rather than the reduction occuring on ribonucleotides

I cannot understand why deoxyribonucleotides are not synthesized directly from deoxyribose, but ribonucleotides have to be synthesized first, and only then can deoxyribonucleotides be synthesized.
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1answer
28 views

How do you write genotypic and phenotypic ratios?

If two homozygous recessive parents are crossed, I know that all of the offspring will be homozygous recessive as well. Would you write the genotypic ratio as 0:0:4 then and the phenotypic as 0:4? (...
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0answers
36 views

Why green light is good for our health? [closed]

I have a knowledge that when you woke up and see green light it increases your sight power. How it does so?
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3answers
8k views

Can a cancerous cell from outside cause cancer in a healthy person?

If a cancerous cell enters the body of a healthy person from someone else's blood or something, will that healthy person get cancer? In human beings.
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1answer
37 views

Can some colours be processed faster/more accurately than others?

Is the human visual / motor system able to track, and move in response to, objects of certain colours more quickly and reliably than for others? By more reliably, I mean with greater accuracy in ...
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1answer
34 views

why finger of hands and feet become wrinkled due to to water? [duplicate]

Mostly due to bathing or washing clothes our finger become wrinkled what was the reason behind it??
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1answer
24 views

Rod and cone photoreceptors are neurons?

i mean the photoreceptors have axon and dendrite and body cell or it is not neuron any more . can we say outer segment of photoreceptor cell is dendrite ? of course these have body cells but i am ...
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0answers
20 views

Why do I feel nauseous at the sight of blood, despite not being afraid of it?

Every time I ask google this question, all it spits at me is info on blood phobias ^-^; basically, I've always been hugely interested in morbid stuff, but I noticed that I always feel sick when ...
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1answer
63 views

Does the deletion of Chromosome 20 cause immunity against prion disease?

I was reading recently about prion disease and it caught my attention that a normal prion protein is coded n chromosome 20, therefore, in order for an infectious prion protein to attack, there must be ...
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0answers
61 views

How “unique” human vagina is?

Regading penis Dixson showed that it is not really unique and complex. This argument (and there were some others) was used against the idea of human polygynandry. But what about vaginal shape? I know ...
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1answer
63 views

Why doesn't it feel suffocating when taking a shower? [closed]

When one walks into a bathroom where someone is (or just finished) taking a shower it is hard to breathe, because it's filled with steam, yet the person taking a shower can breathe just fine despite ...
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1answer
27 views

difference between animal and plant durring organogenesis

i would like to ask about organogenesis of animals and the relationship with plant as we depends on it. me i do not understand why we are totally different with the plant but all of our body made ...
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0answers
40 views

What is 'brainfreeze' and what are its cautions and how to leaa down its risks?

How we will exactly ellaborate the concept of brainfreeze in accordance to brain functions, how is it caused and how we can less its risks?
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2answers
58 views

quadrupedalism in human [closed]

Recently I saw a BBC documentary on a family from a remote village in turkey where one couple has 18 children and out of which 5 are walking on four legs. These children are 28-34 yr old & have ...
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3answers
53 views

Why is the mechanism of inheritance for this disease autosomal dominant?

An unrelated couple has a daughter and a son with the same rare condition. Neither parent has any obvious signs of the condition, but the father's mother (paternal grandmother) and her brother have ...
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2answers
74 views

Red neurons - Acute neuronal injury

“Red neurons” are evident by about 12 to 24 hours after an irreversible hypoxic/ ischemic insult. The morphologic features consist of shrinkage of the cell body, pyknosis of the nucleus, disappearance ...
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2answers
55 views

Tissue fluid water potential

just a quick question. Is the tissue fluid the same water potential as the cells it surrounds? I am a bit confused because if it was lower it would cause water to leave the cell and if it was higher ...
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0answers
18 views

Water loss through the skin

I just have a quick question. Do humans lose water through the skin because of the water potential difference between the inside of the cell and the outside of the cell? Shouldn't water leave the cell ...
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1answer
24 views

Blood pressure in the blood vessels

Why do the capillaries have a lower blood pressure than the arteries even though the capillaries lumen is much narrower. Wouldn't the narrowness of the blood vessel increase the pressure? Also the ...
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1answer
21 views

White blood cells after dealing with an infection

I just have a quick question. If there was an infection of a tissue within the body, white blood cells would leave the capillaries around the tissue and enter the tissues to help cure the infection. ...
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1answer
35 views

Red Blood Cell Size Vs White Blood Cell Size

I have just found out that white blood cells are larger than red blood cells and now I'm confused due to something I learnt in class. Basically, I was taught that there were spaces between the ...
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1answer
37 views

Blood Vessels (Artery Vs Arterioles)

I just have a quick question regarding what my textbook says. I have tried searching online but I have failed to find an answer. Basically, my textbook states that arterioles are smaller in diameter ...
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1answer
35 views

Do you have nerves on the outside of your skull? [closed]

I have a spot on my skull that feels like a nerve or blood vessel. I know that there are many to the brain, however, it is the only one I have ever felt. So do we have nerves or blood vessels on the ...
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0answers
20 views

Why does the exercise level impact the nail growth rate?

I read on https://en.wikipedia.org/w/index.php?title=Nail_(anatomy)&oldid=863800434#Growth: Actual growth rate is dependent upon age, sex, season, exercise level, diet, and hereditary factors. ...
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0answers
23 views

What conclusions can I draw about the size, charge, and shape of messenger molecules?

Molecules such as cAMP or Inositol trisphosphate are used in organisms as messenger molecules that make things happen when they are supposed to happen. These molecules are usually big, but not too big,...
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1answer
38 views

Ciliated Epithelium & Goblet Cells Lining The Trachea

My book states this - The cells produce mucus that traps particles of dirt and bacteria in the air breathed in. The cilia on these cells move this debris up the trachea and into the stomach. Isn't the ...
2
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2answers
36 views

Cross-species infections

I’ve heard that HIV developed from SIV, etc. I’ve also heard that most species (including most monkeys) can’t get a common cold like humans. So then what causes infections to be able to travel ...
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1answer
162 views

Is there a simple incision that would render a man impotent?

I’m writing a novel in which two women (one of whom is a doctor) take revenge on a rapist by performing surgery on him. What would be the simplest but most effective way of causing permanent and ...
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3answers
4k views

Why do hot water baths affect only males' fertility? Why not females'?

Here is the link where urologists are warning men not to take hot water baths. Why does it affect only males' fertility? Why not females also?
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2answers
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Why does resting potential not become continually more negative?

(Firstly, I know this is similar to other questions, but I have read those answers and they do not really cover this topic). My understanding of resting potential: action potential is not being ...
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1answer
97 views

Why Is Gray Matter Gray?

There are different people giving different reason for this popular one 1) white matter is mylinated .this reason was given in reference and few website like this while others say 2)cell body ...
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1answer
35 views

Is there muscle hyperplasia or hypertrophy after surgery?

After exercise there is hypertrophy only. I am curious, if a surgery removes muscle, will there be hyperplasia or hypertrophy to restore it?
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2answers
399 views

Are the first humans black

I have been doing some studies and I believe humans where black before they were white. Black has the ability to create all colors where as white derives from no color so white couldn't have been ...
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2answers
82 views

Infant immunization

I know that polio vaccine consists of small dose of polio virus itself, which activates body's immunity against the disease. An infant is given a no of vaccines including chickenpox, tetanus, ...
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1answer
43 views

What is (roughly) the net charge of the DNA in an average human cell?

I was wondering about what general range for the net charge of DNA in human cells is in Coulombs. I imagine that kind of thing would be hard to measure but could be approximately calculated/estimated....
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0answers
34 views

Can the natural loss of memory be modeled with a continuous function?

Disclaimer: I have little to no background in biology, so this question is based on anecdotal evidence. I've tried to spell out all of my suppositions, but please let me know if I'm making any leaps I'...
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2answers
90 views

Why is Cacao a stimulant?

As I write this I've just eaten a fair amount of cacao (not cocoa) powder and it's given me quite a buzz. I've googled the effects and the Internet seems to think it's somehow psychoactive although it'...
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1answer
22 views

Environment requirement for human life [closed]

I was wondering, what are the humans needs to fulfill to achieve a human colonisation on mars ? Let me explain, this is for role play game in a futuristic world where humans colonized mars. That ...
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1answer
112 views

Is it logical for someone to be allergic to the water molecule, but be perfectly fine with drinking milk since it's only 87% water molecules? [closed]

Recently this article got into the tabloids. The comments were disabled very quickly. Strange. The authos says she has Aquagenic Urticaria but it is a skin condition not an allergy, and hence wouldn'...
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0answers
17 views

Once neurotransmitters bind to its receptors, how does the post synaptic neuron “know” when to start a new action potential?

My textbook seems to gloss over this subject. Once the post-synaptic receptors are activated, do they cause particular ion channels to open, letting positive charge into the cell and inching the ...
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1answer
236 views

What advantage does the pseudostratified epithelial structure type provide over squamous, cuboidal, and columnar?

I'm currently and have had difficulty receiving an answer about the role the pseudostratified columnar structure provides. I understand that that the following have their respective advantages: ...
3
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1answer
124 views

can one be infected with Naegleria fowleri by taking Steam?

will Naegleria fowleri be present in the steam molecules. Many people take steam from hot water to get relief from sinus. I read somewhere that Naegleria fowleri gets killed over 70 C. So steam will ...
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1answer
77 views

Why do neutrophils need to die after pathogen phagocytosis?

From referenced article below, neutrophils need to be removed because its granule contents and oxygen metabolites (used for killing phagocytosed pathogen) are harmful to the surrounding tissue. Thus, ...
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1answer
112 views

Is Human a race? [closed]

Is it correct to say that 'humans' are a race? Will it also include apes and chimpanzees? Can I use the terms 'species' and 'race' interchangeably?
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1answer
60 views

Why do ADULTS need protein in their diet, if they are not growing? [duplicate]

Why do ADULTS need protein in their diet, assuming they are not growing? What happens to the amino acids already present in the body? Why don't our bodies conserve them?