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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Why do people sing?

I was wondering the why people sing, but from a biological point of view. Is it necessary for our body? If it is so, then why can't everyone sing well? Is it in direct relation with neurotransmitter ...
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1answer
37 views

How are some people able to continue growing after reaching maturity?

This is technically a cross-post of a question posted last year concerning gigantism and how certain people are able to grow far past expectations after it's assumed they've reached maturity. How are ...
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what are two materials that are reabsorbed during the reabsorption phase in the process of urine formation? [on hold]

what two material are reabsorbed during the reabsorption phase in the process reabsorption phase? and are there more than two. If not the two main ones?
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Is the human brain the muscle with the greatest leverage? Menu to brain [on hold]

1) The brain being our best lever, muscularly, shouldn't we treat it better? 2) Diet being our best conduit to good health in general, don't we need more competition in the food market, relative to ...
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1answer
36 views

Contradiction to evolution [on hold]

It is said that evolution occurs according to requirement ..if it is true then women who really needs safety should be strong and men who don't should not be strong...isn't it contradictory?
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1answer
52 views

why do overweight individuals sweat more than ordinary people?

A common phenomenon that I have noticed while traveling in buses is that overweight individuals seem to sweat a lot more than people with ordinary weight. Is this a coincidence or is there some ...
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13 views

What are the chances that a hemophiliac male and an unaffected, non-carrier female could have a baby that is a hemophiliac male? [on hold]

The hemophilia gene is located in the X chromosome, which male babies get there X chromosome from their mothers. So the chances of this male baby being hemophiliac is zero. Correct?
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2answers
50 views

Wouldn't it be more efficient to let the kidneys flow into the intestines?

So I was thinking about how much fluids we lose when we pee. Then I realised that it would be much more efficient to remove the bladder and let it flow into the intestines so that the fluids can be ...
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0answers
46 views

If the liver can regenerate why can alcohol abuse permanently damage it?

The liver is a fairly unique organ in that it has the ability to regenerate itself even if parts of it are removed/damaged. It is a well known fact that continual alcohol abuse damages the liver and ...
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16 views

Robertsonian translocation on the same chromosome

is there any big difference between Robert-son-i-an translocation between two 13 chromosomes comparing to a translocation between 13 and 14 chromosomes
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0answers
43 views

Is there an evolutionary purpose for postpartum depression in human females? [on hold]

Essentially what the title says...It seems odd that at the very stage in which new life is supposed to be protected, we see new mothers at a higher risk for particular kinds of mental illness (...
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2answers
51 views

Assume the gene for freckles is dominant. A woman with freckles has a son that does not. What would have to be the genotype of the mother? [closed]

I need help understanding the question I guess. I have read the chapter in my book but still confused.
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13 views

How do implantable devices interact with the human body?

Are there some general methods to prevent biochips implants for unwilling recipients? If implantable devices are embedded in the human body, how does the human body detect and react to foreign ...
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0answers
48 views

can anyone help with the following question that involves cloning? [closed]

1) It has been noted that with the ability to clone animals, endangered species can have their population numbers increased in a short time. How would this impact these populations from the ...
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0answers
23 views

Does increased calorie intake cause increase in libido in humans?

I'm interested in the effect of increased calorie intake on sex hormones and chosen mating strategy in humans. I'm aware that humans have a dual mating strategy - somewhere between pair bond and ...
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0answers
8 views

How long can/will an infant hold his/her breath as part of the dive reflex?

Various other questions on the site have talked about the Diving Reflex, which is also known as the Mammalian Diving Reflex. This reflex is observed in mammals of various species, but also in human ...
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0answers
18 views

Reason for variation in the site of onset of edema

What is the reason for the observed clinical difference in the earliest site of onset of edema in cases of different etiologies? For example, in Congestive Heart Failure, it appears initially as ...
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1answer
56 views

What does completing the course of antibiotics accomplish?

This article from the WHO states: If you stop treatment early, there is a risk the antibiotics won’t have killed all the bacteria that made you sick and that it will mutate and become resistant. ...
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1answer
58 views

Why are bald heads are so “shiny”?

Why do males with baldness have shiny skin on their head, whereas we don't experience such "shiney skin" in other parts of body without hair.
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1answer
69 views

What is the evolutionary advantage of having pubic hair?

Only humans have pubic hair. What is the evolutionary advantage in having it?
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0answers
24 views

How does the human stomach handle a mix of digested and undigested food?

As I understand it, the stomach digests the bolus into chyme and then passes the latter on to the small intestine. This process takes between 40 minutes and a few hours. But what happens when the ...
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1answer
30 views

Are there known functions of AST, ALT, and amylase in the blood?

A number of enzymes can be measured in the blood or plasma that aid in the diagnosis of certain diseases. For example, patients with particular liver diseases may have elevated aspartate ...
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1answer
16 views

Neuron activity on body parts measurable?

Is it possible to measure the neuron activity on body parts like the back or the arm? Or is this done already? Of course neuron activity can be measured on the scalp using an EEG. I wonder if similar ...
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1answer
38 views

Human Demography - Where can I find this statistic?

In "An Introduction to Genetics" by David J. Merrell, copyright 1975 by W.W. Norton + Co., p. 742, in the Chapter "Genetic Counseling and Eugenics," the author states: "... 50% of the women produce 85%...
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0answers
12 views

Are apples really better for the immune system than most fruit? [migrated]

"An apple a day keeps the doctor away", the saying goes, implying that apples are somehow especially good for the immune system. But does this idiom have any validity to it? Are apples high in ...
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0answers
39 views

Stopping the Gag Reflex: How and why does it work?

I was talking to some friends over the weekend, and one of them made a comment about gagging. He said that he read or watched that clenching your thumb with your other fingers (making a tight fist ...
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32 views

Why people have less hair than other primates? [duplicate]

Well as you can figure out, most primates such as monkeys, gorillas and chimpanzees, have all their body covered with fur. As we know they are evolutional "relatives" to us humans, but we dont have ...
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1answer
103 views

Why did we evolve to control our breath?

I had this question in my mind and tried to think of why we would evolve to be able to control our breath. I remembered the Aquatic Ape Hypothesis, which makes a lot of sense and would explain it, ...
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1answer
43 views

Amino Acid requirement + intake in relation to diet + meat type [closed]

I was arguing with a friend: I said: The Yulin festivals cannot be condemned by western culture, as we also kill animals in equally cruel ways. She said: It isn't just that the killing is cruel, ...
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46 views

Why is sex pleasure giving activity but not childbirth?

Asking from an evolutionary viewpoint. Sex is a pleasure giving activity so that it encourages reproduction and spreading of genes. But childbirth ,the most crucial part of the reproductive process, ...
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2answers
126 views

Can the human body create glucose out of fat?

I read conflicting views about whether or not the human body can create glucose out of fat. Can it?
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3answers
81 views

Cancer biology: Can tumors form from cells that are genetically identical to non-cancerous cells?

Can a tumor begin to form without any genetic mutations? I'm specifically interested in a tumor which could later lead to cancer.
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2answers
58 views

How is UV light damaging DNA as the chromosomes are deep in the cell?

When UV light is on your skin it has to go through the cell membrane and to the membrane of the core. So it looks like that the DNA is protected. But it probably isn't. But can't membranes not been ...
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1answer
12 views

How do molecules signal pre synaptic neurons to activate? [closed]

How do molecules signal pre synaptic neurons to activate? and also is it more the structure or the elements in the molecule that allows it to activate the neuron also how do molecules bind to ...
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0answers
34 views

Why does crippling pain exist? [closed]

Some kinds of trauma can cause pain so severe that it makes you unable to move or do anything at all. It may put you out of action and unable to help yourself because of how excruciating it is. ...
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43 views

Is there an evolutionary advantage associated with migraine? [duplicate]

I have read Wikipedia article on Genetics of migraine headaches and I don't buy it Because genetics influence susceptibility to migraine, it can be shaped by evolution. Fitness-impairing ...
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2answers
71 views

Difference between water and tea [duplicate]

My friend heard that tea is worse for drinking than water because "cells have a special membrane and tea has special supplements and membrane doesn't let tea pass and this is why skin is dry even when ...
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1answer
284 views

What's the mechanism for being mentally tired?

I notice that after long tests, or long periods of critical thinking, my body and mind feel noticeably tired. Why does this happen? Are the neurons in my head not firing as quickly, or is there just a ...
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2answers
49 views

Why is oxygen and CO2 measured in pressure instead of mmoles/L like other ions?

Na, K, Cl...All measured in mmol/L in plasma. Why is oxygen and CO2 measured in pressure (mmHg)? (I guess it has something to do with them being bound to RBC but I don't know why the difference).
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67 views

Why does sex give people pleasure [closed]

My question is Why does sex give people pleasure? I know that the pituitary gland secretes sex hormones and the sex organs receives the signal. How is it related to dopamine at last? Through ...
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1answer
63 views

Is it necessary to remove a bullet from the body? [closed]

So here is the proof: William Lawis Pace lived with bullet in his head for many years & even hit 100. However, both in real life and movies, we often see doctors struggling to remove bullets ...
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1answer
74 views

Living on pure glycogen?

I was recently fascinated when I learned about polysaccharides (I am a biology newbie) and was wondering about some of their properties. After doing some googling I was unable to find any information ...
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1answer
59 views

How do cancers eventually lead to death / other debilitating symptoms? [closed]

With regards to people I know or have read about who live with cancer, most of their symptoms are results of chemotherapy, surgical interventions, etc., which have the goal of eradicating the cancer. ...
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1answer
32 views

Resting stage of primary oocytes

In my biology textbook, I read that the primary oocyte gets arrested in the early stages of meiosis in prophase I (diplotene stage). I wanted to know why this is so. I searched google, and this ...
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23 views

Lyonization and Turner's syndrome

If lyonization is basically inactivation on X chromosome, and Turner's syndrome patients have only one existing X chromosome, what is the difference between healthy women with inactivated X chromosome ...
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1answer
125 views

How can alcohol cause blindness?

Strong alcoholic beverages (e.g. moonshine) are reported to have caused blindness amongst some people. How exactly can alcohol make someone go blind? Is that because different forms of "rubbing" ...
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2answers
102 views

How do T-cells determine which cells they've already inspected?

From what I understand, T-cells are constantly traveling in the body, inspecting cells by looking for antigens. If they're self antigens, then the T-cell doesn't attack, whereas if they're non-self, ...
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2answers
66 views

Is saturation of olfactory cells able to create a feeling of another odour when it stops?

I'm looking for at least one scientific study about how odours could impact human olfactory system and create some phenomenon that could be loosely compared to retina remanence. As an example, with ...
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13 views

Modeling a patient's parameters (SPO2, HR, BIS etc.) to their effect on the patient

I'm currently using code (C#) I wrote which creates a 3 compartment model to simulate the concentration $C_{p}$ of Propofol in blood plasma using the Schnider and Marsh pharmacokinetic models. I ...
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1answer
31 views

Why do people cut back on kilo-calories?

I am learning about specific heat in science and I learned about how the specific heat for water is called a calorie, but that is different to what is on the food label. On the food label, that ...