Questions tagged [physiology]

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Should we invert other ECG leads if aVR was positive?

I would like to seek your kind guidance in understanding the right way of solving this question. (for the context, so far we only covered normal ECG and axis deviation) The question displays all 12 ...
helplessstudent147's user avatar
1 vote
1 answer
52 views

How to determine QRS voltage from ECG?

Attached below is a question from my textbook "Guyton and Hall Textbook of Medical Physiology Review, 4e" and I am confused because the solutions manual has the answer as B (0.5mV), implying ...
helplessstudent147's user avatar
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Do you know of any papers investigating the practice of "back cracking"?

I found a good number of studies investigating the effects and practice of "knuckle cracking", but close to none on other sites of joint cracking/popping. knuckle cracking appears to be safe,...
Francesco Favro's user avatar
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25 views

Pressure volume curve; Is it wrong Ea?

This is a continuation of the following question; Pressure volume curve; Is it wrong ESPVR? In the pressure volume curve, if my understanding is correct, Ea is obtained by the following diagram (Refer ...
Blue Various's user avatar
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1 answer
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Pressure volume curve; Is it wrong ESPVR?

ESPVR is a straight line passing through the upper left corner point of the pressure volume curve and such that the x-intercept is the dead volume of the ventricle; as far as this definition is ...
Blue Various's user avatar
1 vote
1 answer
97 views

What's the cause of change in pitch of nearby sound when you move your head?

I was familiar with this phenomenon since my childhood. But I got curious about it just recently. For example, imagine you are in a restroom with an air conditioning fan which produces sound while ...
Snack Exchange's user avatar
1 vote
0 answers
27 views

What is the difference between the vasomotor center and cardiovascular center in the brain?

The vasomotor center is introduced as the following in our coursework: The vasomotor center is located bilaterally in the reticular substance of the medulla and lower third of pons. It contains the ...
Filthyscrub's user avatar
1 vote
0 answers
14 views

On an ECG, do we take the J point to be the baseline or the TP segment?

I'm studying current of injuries and the diastolic current theory is explained as such: The ECG machine is programmed to keep the T-P segment at baseline with everything else on the strip moved up or ...
Filthyscrub's user avatar
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1 answer
88 views

Why does lack of exercise cause heartburn? [closed]

In my experience and according to medical advice I’ve sought in the past, heartburn can be caused by extreme lack of movement. (as an aside, isn’t there a single word that means “tendency to not move ...
Seeking answers's user avatar
3 votes
0 answers
114 views

Does Wim Hof's breathing method accelerate the aging process of the body?

Wim Hof's breathing method is acclaimed to improve physical and mental health by following the following routine once every day: 30 deep, strong breaths breath-hold after exhalation for as long as ...
Eti2d1's user avatar
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-1 votes
1 answer
79 views

Augmented lead equations

Extremely confused with augmented lead equations. Apparently - aVL = (Lead I - Lead III) ÷2 -aVR = (Lead I + Lead II) ÷2 aVF = (Lead II + Lead III) ÷2 I can't figure out why we're subtracting Lead III ...
user25782's user avatar
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1 answer
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Reason for ecg volume conduction waveform?

Can somebody for the love of humanity and genuine curiosity explain why does the voltage between 2 oppositely charged ends of a progressively depolarizing cell peak when the wave reaches the middle ...
user25782's user avatar
5 votes
1 answer
89 views

How does colloid pressure help in maintaining fluid inside blood vessels?

I learned in my physiology course that hydrostatic pressure is the pressure that fluids put on the wall of blood vessels and therefore, the fluid tends to get out of the blood vessel and that makes ...
Yazan Amjad's user avatar
1 vote
1 answer
168 views

Why do ventricular action potentials have no local potentials like neuronal action potentials?

I noticed that the depolarization in the ventricular action potential (bottom image) is just a sharp spike, with no local potential that gradually achieves the threshold potential (like the top image, ...
Doe Pull's user avatar
3 votes
1 answer
256 views

Why do we use mEq/L instead of mmol/L to quantify physiological electrolytes?

I was looking at a table in my Guyton and Hall Medical Physiology Textbook, specifically in the membrane potential chapter, and noticed that the concentrations were written in that table using the ...
Doe Pull's user avatar
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2 answers
124 views

What is the specific relationship between Prehormones, Prohormones and PreProHormones?

What is the basic sequence of pre-, pro- and prepro- hormones leading to the formation of the final mature and active hormone? I am asking because this PowerPoint slide in my Endocrinology ...
Doe Pull's user avatar
3 votes
1 answer
92 views

macular insult during optic neuritis

In our lecture today, the professor gave us a trick question: although papilledema and most optic nerve/disc pathology cause either generalized visual field depression or visual field defects, sparing ...
kljiuklk 1's user avatar
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0 answers
51 views

What determines flexibility?

I'm sorry if this doesn't qualify as a question for this stack. I thought about putting it on "Physical Fitness" but don't think it fits there and is better of here. Please move it not ...
steros's user avatar
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1 answer
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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??
Mohammed Showekh's user avatar
1 vote
1 answer
41 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 (...
A. Kvåle's user avatar
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1 answer
44 views

Muscarinic receptors in bladder

ACh contracts the wall of the bladder(by M3 receptor). How does it relax the sphincter?
Omar's user avatar
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1 vote
0 answers
144 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 ...
Sudie's user avatar
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1 vote
1 answer
121 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 ...
Mrinal Gautam's user avatar
-1 votes
1 answer
80 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 ...
user1271772's user avatar
1 vote
1 answer
30 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 ...
Dahen's user avatar
  • 145
-2 votes
1 answer
77 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 ...
Amila Dulanjana's user avatar
1 vote
0 answers
19 views

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 ...
ayazasker's user avatar
1 vote
0 answers
14 views

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 ...
Physicsapproval's user avatar
1 vote
0 answers
55 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 ...
Chris Rogers's user avatar
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5 votes
1 answer
524 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 ...
High GPA's user avatar
  • 161
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0 answers
55 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, ...
High GPA's user avatar
  • 161
1 vote
1 answer
33 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 ...
abacus143's user avatar
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3 votes
1 answer
74 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 ...
abacus143's user avatar
  • 453
3 votes
1 answer
33 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 ...
Chloritone_360's user avatar
3 votes
1 answer
250 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 ...
abacus143's user avatar
  • 453
2 votes
1 answer
160 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 ...
Dylan Patel's user avatar
2 votes
1 answer
58 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. ...
Reflexive's user avatar
  • 123
2 votes
1 answer
122 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 (...
Chris Rogers's user avatar
  • 6,164
4 votes
2 answers
194 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 ...
2569cfa's user avatar
  • 53
4 votes
1 answer
1k 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 ...
octern's user avatar
  • 305
5 votes
1 answer
181 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) "...
Christopher.L's user avatar
0 votes
1 answer
61 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 ...
Atanas Bobev's user avatar
0 votes
0 answers
25 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 ...
user2591935's user avatar
10 votes
2 answers
1k views

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 ...
Tomáš Zato's user avatar
4 votes
2 answers
291 views

How much Vitamin D does the body produce if you're out for a whole summer day?

Imagine that a person is outdoors the whole day in the summer. They're tanned enough that they don't get sunburn. How many IU (International Units) of bioavailable Vitamin D do they produce in a way? ...
Christian's user avatar
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2 votes
0 answers
86 views

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?
Göktuğ Aşçı's user avatar
-1 votes
2 answers
83 views

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.
user avatar
0 votes
1 answer
45 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 ...
Butterfly and Bones's user avatar
3 votes
0 answers
64 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 ...
Butterfly and Bones's user avatar
3 votes
0 answers
213 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 ...
L.B.'s user avatar
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