Questions tagged [physiology]

The study of the normal function of living organisms and their anatomical parts and the means by which their normal functioning is achieved.

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2answers
9k views

Wim Hof Method claims Alkaline Blood is Good. Contradictions? Counterproof?

The Wim Hof Method claims, that it is beneficial to have alkaline blood. On the other site there is the medical claim that if the pH-value is not within the range of 7.36 – 7.42, enzyms are ...
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0answers
36 views

When we laugh or run for sport which autonomic system works?

When we laugh or run for sport which autonomic system takes place in this time? While I am not sure what happens in heart while laughing (tachycardia or bradycardia), but for sport running I'm sure ...
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1answer
132 views

Continuous (yeast) culture system satisfying multiple criteria

There are multiple ways yeast cells can be grown in liquid cultures. Batch cultures are easy to prepare but cell density, medium composition and physiology change over time Chemostats allow to ...
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3answers
2k views

Public database of animal specifications

I'm a math teacher looking for data to help my students interested in biology complete a quantitatively flavored study of animals. (As a math person, I apologize if I'm not using discipline-...
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1answer
67 views

Is there a name for the use of sunlight in metabolic processes?

"Photosynthesis" is what is used to describe how plants use sunlight to synthesize sugars, but, I also heard some animals like humans use sunlight in the process of creating vitamin D. Is there a ...
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0answers
3k views

Do sharks fart?

My son is 5 and I'm encouraging him to be curious and ask questions of the world around him. He asked if sharks fart and how does it smell? He feels that it would smell of fish and be disgusting. He ...
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0answers
77 views

Why is the glomerular filtrate isotonic to the blood in the capillaries?

How can the osmolarity of the filtrate be the same as the blood in the peritubular capillary when there is no red blood cells filtered?
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1answer
282 views

What are the limiting factors of human stamina?

What are the limiting factors of (human) stamina? Let's define stamina as the capacity to continue doing a physical activity. We clearly have our limits, so what aspects of physiology impose a limit ...
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1answer
503 views

Why do musk deer have the smallest red blood cells and amphibians have the largest?

What is the reason that musk deer have the smallest red blood cells and amphibians have the largest? Should they not be proportionate to the size of the organism?
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0answers
58 views

What is the benefit of reducing inflammation when producing antibodies?

We just learned in lecture that IL-10 promotes the formation of plasma cells over memory cells. Which seemed strange to me as IL-10 also reduces inflammation, and I figure you would want inflammation ...
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3answers
5k views

Why is wombat scat (feces) shaped like cubes?

I've heard that wombat scat is cube shaped, but I don't understand how that can happen. Has anyone studied the phenomenon? What would the evolutionary pressure have been to cause this?
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1answer
205 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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1answer
40 views

Common english name for tissues which are separated from the blood by blood-tissue barriers

Which general term is used to denote such organs/tissues as: brain, testis, thymus etc., which are separated from the blood by blood-tissue barriers?
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1answer
87 views

What physiological processes give rise to a linear cell survival curve?

If we plot the number of surviving cells in a structure over time (assuming no replacement), the shape of that curve should imply something about the underlying process responsible for cell death. For ...
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2answers
65 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
40 views

What is (are) the medium of conduction for an electrical current with an external source in the human body?

I am trying to get some background for some personal research I am doing into the effects of Electro Convulsive Therapy. I don't understand how electric current from an external household source, say, ...
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1answer
2k views

Why do crocodiles have a high concentration of lactic acid in their blood?

Crocodilians have high concentration of lactic acid in their blood. This is the cause that prevents them from prolonged intense activity, since prolonged intense activity causes the muscles to secrete ...
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0answers
62 views

Hematuria due to Nitric Oxide

Drug interactions between properly dosed NO and other medications are not expected, but side effects may include noisy breathing, hematuria, or possibly atelectasis. (pg.no:577; Goodman and Gilman ...
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0answers
39 views

about the muscle's tension's variables

I'm reading the paper "THE PROBLEM OF THE INTERRELATION OF CO-ORDINATION AND LOCALIZATION", which is written by N. Bernstein. The paper said "The degree of tension of a muscle is a function, in the ...
2
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1answer
117 views

Is every neurotransmitter receptor an ion channel?

This is a rudimentary question--perhaps the answer is well known to biologists, but is every neurotransmitter receptor also an ion channel? For example, NMDAR is a glutamate receptor and cation ...
2
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1answer
103 views

Are we evolving as fast as the oxygen is depleting?

How much oxygen saturation have we lost in the last 100 years? As oxygen levels dwindle and industry, deforestation, and population increases, at what year and saturation will the low levels of ...
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2answers
185 views

How does 2,3 biphosphoglycerate works to release oxygen bound to the hemoglobin?

I read on Wikipedia that 2,3 BPG binds with the deoxygenated state of hemoglobin and helps in stabilizing it. It was also written that it helps release remaining oxygen from the hemoglobin. How? ...
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1answer
1k views

Mechanism by which hypokalemia reduces insulin secretion

Is there any known mechanism by which hypokalemia reduces insulin secretion? This video explains a mechanism, but its inherently wrong because ATP dependent K+ channels will allow movement of K+ from ...
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0answers
67 views

Is there a biological determinant for right- or left-handedness?

When I was very young, I was sent by parents to examination where I was told both my hands are dominant in the same way. My parents preferred to make my life easier and chose to focus on my right hand ...
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1answer
1k views

Why does applying pressure to a venipuncture site prevent haematoma?

From what understand, when drawing blood, a phlebotomist puts pressure on the venipuncture site while withdrawing the needle to prevent a haematoma. I'd like clarification; How does this prevent a ...
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1answer
1k views

Are all mammals capable of sneezing?

I only know dogs and humans sneeze... so do other mammals sneeze as well? Is it possibly an evolutionarily-determined immunological trigger?
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1answer
150 views

How increased potassium intake increases sodium excretion?

"K+ antagonises the biological effects of Na+". I have been reading the same many times without any explanation. How actually (mechanism) K+ helps excretion of Na+?, their interactions? And eventually ...
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1answer
193 views

Does estrogen increase muscular growth in females?

Regarding humans it is said that most psychological effects caused in men by testosterone are caused in women by estrogens. There are many studies on that, particularly regarding temporary shifts of ...
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1answer
30 views

Square-cubed law and health

Does the square-cubed law lead to possible health detriments for taller people? I'm not sure what the optimum height is for humans (e.g. due to their cross-sectional bone density constraints), but ...
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0answers
292 views

What do Caucasians see in their peripheral vision, and how is their visual field?

I am an Asian who has no idea how much of their nose Caucasians (especially for those with extremely deep-set eyes, very prominent and low brow ridges, and high noses like Brian Shimansky or Rishi ...
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1answer
31 views

Are “Rings” in fish like rings in a tree? [closed]

A lot of fish have structures like the rings in a tree. Is the number of “rings” an indicator of age, as in a tree, or is it fixed?
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2answers
43k views

Why can't we kill ourselves by holding our breath?

Is it possible to kill yourself by holding your breath? This question is obviously copied from Quora, but I had heard it as a fact that we cannot kill ourselves by holding our breath and I'm looking ...
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2answers
147 views

Phospholipid membrane fluidity if phospholipid had one type of fatty acid

How would membrane fluidity change if the phospholipid membrane had only one fatty acid?
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1answer
2k views

Ventricular Filling : Systole or Diastole?

As the Blood goes down from the Atrium to the Ventricles: The Tricuspid Valve ( Right Atrioventricular Valve) Bicuspid Valve (Mitral Valve ) The atrial pressure is INCREASES WHEN ATRIA ( THE ATRIA ...
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0answers
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Can humans derive any nutrition from eating the bones of animals?

Bones contain many nutrients like Calcium and phosphorus. And I'd take a guess that some kind of bones like bones of a chicken(hollow) aren't dense enough to be much of a problem during digestion. ...
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0answers
89 views

What does it mean for sodium and water reabsorption to be "coupled" in the nephron?

If sodium is transported across the tubule membrane down the concentration gradient established via the $Na^+$/$K^+$ exchanger via symport with glucose and antiport with hydrogen, and water is ...
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1answer
156 views

Does the brain consume more energy when a person is stressed or anxious

When a person is anxious or stressed or suffering from chronic depression, it is observed that the person is usually tired. Is there there a connection between fatigue and racing thoughts/obsessions. ...
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0answers
200 views

How to obtain normalised ECG given ECG readings across lead 1, 2, and 3?

I saw this youtube video on ECG readings and cardiac dipole vector locus of the heart across the three leads. Posting screenshots from it: My question is how to obtain the graph (2nd image) from the ...
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0answers
213 views

Why is the Mongolian Horse superior in stamina?

I've heard a lot about the Mongolian Horse over the years, especially that it has more stamina than the Arabian Horse. It's a little smaller/lighter than an Arabian. Apparently the Mongol Horse can ...
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1answer
36 views

Using formulas to explain why contraction of blood vessels leads to increased blood pressure

I know, I know this is probably a question too simple to be asked on a forum like biology stack exchange. Problem is, I looked many places and can't seem to find a more mathematical approach to ...
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1answer
26k views

Why can I raise my left eyebrow independently from the other but not the right?

I've seen the same question on other forums, but have not come across any definitive explanation. The non-cited answers seem to fit into three categories: It is due to greater muscle dexterity on ...
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1answer
41 views

Nonpancreatic digestion of tryglicerides

In an answer about coconut oil I can read the digestion of coconut oil does not involve in the Pancreatic digestive enzyme system In both primary and secondary school I have learned that fat needs ...
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0answers
39 views

sweet receptor's affect on insulin release

So I understand the basics of how the body releases insulin to keep blood glucose levels in check and (loosely) that higher insulin levels can lead to more (or at a faster rate) glucose being stored ...
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2answers
205 views

Are all of our hormones synthesized in the same gland that they are secreted from?

For example, growth hormone is secreted from the anterior pituitary; is it also synthesized there?
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1answer
563 views

Do mosquitos excrete blood?

Since insects like mosquitos ingest only blood, and insects generally excrete their solid and liquid waste at the same time as frass, I was wondering: is mosquito defecation more like iron pellets or ...
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1answer
198 views

Do local potentials always precede action potential?

Do all stimuli change the membrane potential to a value lower than threshold potential first, and then by summating end up in an action potential? How do voltage-gated ion channels detect this change ...
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0answers
20 views

What is the physiological mechanism for getting unconscious after a punch to the head? [duplicate]

It is the everyday life in boxing: One boxer gets a smack in the head, cannot do anything for many seconds and then: Victory of his opponent due to a Knockout! What is the reason for losing ...
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1answer
37 views

Why placental progesterone suppressed or drop before onset of labour?

As we know during pregnancy predominant hormone is progesterone which is at early pregnancy about first 3-4 months produce by corpus luteum of pregnancy together with estrogen after that placenta can ...
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1answer
42 views

What is the mechanism behind sympathic effusion of serous cavities due to nearby abscess?

Patient with left perinephric abcess which does not ruptured have reduced breath sound that is mostly due to plural effusion revealed by CT scan which was sterile. I found this called sympathetic ...
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1answer
74 views

Why do left and right eyes can require different power of lenses?

Both the eyes almost see the same things throughout our life. It is not like we use one eye more than other that it should become weaker. What causes requirement for different power of lenses for both ...

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