Questions tagged [physiology]

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How can myocyte contract in "isovolumetric contraction" phase of cardiac cycle without shortening?

What is the difference between a contraction that shortens the muscle and generates force and the isovolumetric contraction that generates force with shortening the muscle??
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1answer
38 views

What is considered moderate when referring to (sub)acute hypertension, hyperthermia and tachycardia?

I'm reading about the toxicology of LSD, and the acute and subacute adverse effects (hypertension, hyperthermia, tachycardia) have been described as moderate in this article, modest in this article (...
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Why do spinal shock syndrome and upper motor neuron lesion have different features?

While discussing the differences between UMN and LMN lesions, one of the most characteristic feature discussed is spastic and flaccid paralysis respectively. Since spinal shock syndrome requires ...
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8 views

Why does ALP become raised in obstructive liver disease?

I can't find any logical answer on the internet - sorry if I'm just being stupid! In my head: if the bile duct is blocked/cholestasis (eg. by gallstones) then surely substances can't leave the liver ...
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1answer
21 views

Muscarinic receptors in bladder

ACh contracts the wall of the bladder(by M3 receptor). How does it relax the sphincter?
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Why is it that some parasympathetic actions are not always as discrete and localized?

Lacrimation does commonly occur with salivation especially when eating spicy food. Urination also tends to occur concurrently or shortly after defecation. If the parasympathetic nervous system is ...
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24 views

How does calcium affect magnesium absorption?

I was recently reading up on hypomagnesemia and found that hypoparathyroidism could be the cause of this imbalance. The book I was reading (Mosby's Manual of Diagnostic and Laboratory Tests) explained ...
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12 views

The Roles of SSRIs and Neurotransmitters in Migraines

How do SSRIs alleviate migraine pain? Can anyone shed any light into the mechanism please? More broadly, I am interested in the roles of neurotransmitters in the cause and potential prevention of ...
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1answer
76 views

Why is trypsin inhibitor present if trypsin is already secreted in form of trypsinogen?

I was reading pancreatic digestive enzymes from a Textbook of Medical Physiology and I came across Trypsin Inhibitor, it stated that It is important that the proteolytic enzymes of the pancreatic ...
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53 views

How can a ruptured ulcer all the way in the duodenum, cause kidney failure?

The famous Nobel Prize winning physicist is said to have died because "A ruptured duodenal ulcer caused kidney failure", leading to his death 12 days later. I understand that the kidney ...
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1answer
27 views

How come Anti-D administered to Rh-negative mothers doesn't cause sensitization to the Rh antigen

As I understand it, the anti-D will coat the fetal Rh+ RBCs, and since these have been marked by IgG, they will get phagocytosed among other things that will result in their destruction. If the RBCs ...
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64 views

How to Determine How Much Water to Drink [closed]

I am planing to develop a mobile application to monitor the water intake level of a person. I found the following calculator, but I have no idea what is the formula that they have used in the ...
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What would the graph look like if the electrodes were non-equidistant from the depolarization wave?

Hypothetically speaking using the diagram above. If the negative electrode was very far away from this cardiomyocyte and the positive electrode was right next to it. What would the voltage graph look ...
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What happens to ICF in primary aldosteronism?

There is contradictory information in my two textbooks, As per Kaplan Physiology 2018, There is gain of isotonic fluid, because aldosteronism cause Na+ retention and water follow, so osmolality ...
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43 views

Natural hymen repair

When conducting a general Google, most sites that come up are plastic surgery sites advertising "virginity repair" (hymenoplasty or Hymenorrhaphy). Apart from that, there are articles, for ...
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1answer
140 views

What is the percentage of woman without a hymen?

The Wikipedia entry (https://en.wikipedia.org/wiki/Hymen) suggests that Hymen can be completed absent inborn. I read through the textbook referred by Wikipedia, but that textbook does not include any ...
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52 views

Is the status of "sexually-active" self-reported by the patients?

In the medical and social research concerning "sexual activity" of man or woman, for example: Can tampon use cause hymen changes in girls who have not had sexual intercourse? Nevertheless, ...
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1answer
22 views

What is the functional difference between cardio-pulmonary and the baroreceptors in the regulation of Blood pressure?

Guyton mentions two types of receptor- the baroreceptors and the cardiopulmonary receptors- that are involved in the maintenance of the acute changes in blood pressure. I just wanted to know how these ...
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1answer
56 views

What causes a notch in the atrial pressure?

I wanted to know why there is a sort of fluctuation in "E" in the tracing of the atrial pressure right before the mitral valve opens (not the notch because of the Aortic valve closure). Source for ...
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1answer
28 views

Why does a rise in cAMP potentiate PGI2?

In my book Principles of Physiology (by Debasis Pramanik), it is mentioned that dipyridamole inhibits phosohodiesterase which increases cyclic adenosine monophosohate (cAMP) which potentiates ...
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1answer
164 views

Ventricular diastolic pressure?

So, I have been wondering and couldn't find texts explaining this, but why is the diastolic volume of the circulation ~80, while that of the ventricles is almost 0. To phrase it another way, why does ...
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1answer
49 views

Positive deflection of an ECG

I understand that the voltage will be positive as measured by the ECG but I was wondering why the voltage reaches a maximum exactly at the midpoint. Is there a physiological reason (like sodium ...
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1answer
52 views

How much do our bodies heat up when we shiver?

I think that this question is on topic for this site as it states human physiology and pathophysiology is allowed. If not then please let me know in the comments and I shall delete this Question. ...
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1answer
76 views

Can there be advantages to polydactyly?

I have been reading about polydactyly and found that surgery is only necessary in certain cases. It depends on way the extra digit on the hand or foot is attached. For example, central polydactyly (...
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2answers
109 views

How does one determine which textbook to start with when wanting to build knowledge in medical sciences? [closed]

The medical field is vast and there is a great deal of literature, including textbooks. Is there a clear progression of textbooks that one could go through in order to build knowledge in the medical ...
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1answer
655 views

"Blood rushing to the head" during handstands: How is it regulated?

Many people who start practicing handstands or headstands report discomfort in their head, ranging from a mild sense of fullness to "my head is going to explode." The standard response in online ...
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1answer
174 views

To what degree does tactile stimulation affect muscle tone?

Hard to find the appropriate board for this, but I'm after an answer from a neuro-perspective. A Naprapath once tested the tone of different muscles concluding that I was, quoting, (globally) "...
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1answer
54 views

Calculate blood coming out from cut blood vessel per minute

I am probably searching for some math equation which takes BPM and some specific blood vessel index to calculate blood outcome.(maybe including hearth entropy) If for example we took right subclavian ...
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23 views

What's the exact value of blood Ph and how is it corrected

what is the exact value of the blood ph, how is it corrected and at what precision ? Has there even been a real time high precision analysis of the blood ph ? where we could see the correction ...
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Can cigarettes help trigger bowel movements?

There is a popular belief that a coffee and a cigarette in the morning contributes to having a bowel movement at that time. There is already somewhat of an answer for the question to why coffee seems ...
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What is the indirect - direct bilirubin ratio in the blood in physiological conditions?

What is the ratio of amount of indirect and direct bilirubin in the blood in a healty individual?
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Should everyone take an annula flu vaccine?

Flu is a disease of all ages, with worst complications and risk of death in babies and the elderly, but people of all ages can get very sick or be hospitalized.
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43 views

What's up with migraine auras? Why do they occur sometimes with migraines, but not always? What are they even?

When I was a small child, I thought I was performing magic whenever these migraine-auras developed, and I would ask my younger brother if he wanted to see a magic trick. I'd have him close and open ...
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48 views

Why/how does stress sometimes cause a spike in WBC or even a fever?

I've noticed a direct correlation between a spike in my WBC (when I don't have an detection of a viral or bacterial infection) and sometimes (but pretty rare for me), an elevated body-temperature that ...
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202 views

Weight loss during death

Yesterday, a family member and myself were discussing the dying process (a family member recently died). It was brought up to me that - supposedly- the human body losses weight at or very near the ...
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1answer
2k views

Can weak people use their feet when doing CPR?

Could doing CPR with a foot cause harm to the recipient? In a situation where the rescuer were unable to continue due to fatigue of the arms, is there a way to safely do CPR with the foot?
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3answers
208 views

Do adult humans need to drink milk

To the best of my knowledge, most mammals cease to drink milk past infancy. Humans, on the other hand often substitute their mothers breast milk with that from other sources like cattle (or soy, ...
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2answers
155 views

What is the field of medicine divided into? E.g. Anatomy and physiology

What are all of the 'sub-categories' what make up the field of medicine? E.g. physiology and anatomy. I'm looking into lectures to learn so please list the fields, places for potential resources and ...
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1answer
209 views

Is it possible to tell if a person is awake or sleeping by capturing his finger print at that moment?

Consider A is a person, is there any possibility to find if he is awake or asleep?, Maybe the lines on the finger be compressed or the blood flow might be low while sleeping.
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37 views

What is the mechanism by which diarrhea is triggered?

I know that many things, from stress to pathogens, can cause diarrhea. But I was curious what in the digestive tract detects that something is wrong (eg are there chemoreceptors which find problems, ...
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1answer
2k views

How does the Jendrassik's manoeuvre reinforce reflexes?

According to Wikipedia, The Jendrassik maneuver is a medical maneuver wherein the patient clenches the teeth, flexes both sets of fingers into a hook-like form and interlocks those sets of fingers ...
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1answer
69 views

Effects of eating healthy food for a limited amount of time

if we for example went on a healthy life style for a limited amount of time like 3 months. Then, we reverted back to our less healthier life style that we initially had. Will the reverted for (less ...
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181 views

Can oversleeping be harmful to overall health?

Is it worse than undersleeping, especially for healthy development? Does it have any benefits? I would like to know both physical and mental effects (or diseases?).
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173 views

Does exercising lower your lifespan?

I read that the consumption rate (Cal) of stronger muscles while resting is higher than that of less dense muscle tissue. Kleiber's Law and Rate of Living Theory states that organisms have circa the ...
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1answer
2k views

My saliva turns sour when I'm angry. Is it a common phenomenon? [closed]

Every time I get angry, my saliva turns unpleasantly sour (or at least it feels such like that - it is sour and it burns me on the back part of the upper palate or somewhere there). As kid I thought ...
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Correlation between pre-pregnancy training level of abdominal muscles and the risk of getting diastasis recti

Is there any evidence that (very) strong or (very) weak abdominal muscles before becoming pregnant increases or decreases the risk of developing diastasis recti during pregnancy? If so, what are the ...