Questions tagged [blood-pressure]

the pressure of circulating blood on the walls of blood vessels. When used without further specification, "blood pressure" usually refers to the pressure in large arteries of the systemic circulation. Use this tag in questions related to measurement and study about blood pressure and diseases which involve high/low/irregular blood pressure.

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12 views

What actually produces the diastolic phase 3 Korotkoff sound while taking blood pressure?

I keep looking online for an answer to how exactly a noise can be heard during diastole when taking blood pressure. I understand that in phase 1, the force from the blood hitting against the pinched ...
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25 views

Why is pressure in renal artey higher than aorta?

I am preparing for an exam. I have come across this question recently that pressure in aorta is less than that in renal artery. I am aware of the effect of gravity on venous pooling and high venous ...
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1answer
273 views

Osmosis and hydrostatic pressure

I'm confused about the role of hydrostatic pressure compared to osmotic pressure. Q1:If I have a U-tube with a membrane permeable only to water molecules and equal volumes of water on either side ...
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1answer
273 views

How to understand the biophysics and math behind a 0.2 second delay between the pulse in my arm and my ankle?

I recently had a test with six blood pressure cuffs; 2 each on arms, ankles and big toes. During the test I could feel the pulses in my arms and legs, and noticed a distinct ~0.2 second delay between ...
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113 views

Pressure measurement blood flow

During blood pressure measurement, when the flow within the arteries of the arm is interrupted, how is blood flow redistributed to the rest of the circulatory system? Is it possible that more blood ...
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17 views

Why is heparin contraindicated in patients with severe uncontrolled hypertension?

Heparin is a parenteral anti coagulant- prevents clot formation by inhibiting factors 2 a and 10 a mainly. Now, patients with severe uncontrolled hypertension- have persistent bp of more than 140/90. ...
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2answers
159 views

How do physics notions of fluid dynamics relate to pressure gradients in circulation?

I'm having a hard time comprehending why sometimes physiology notions seem to contradict each other and contradict physics teachings. More specifically I don't understand why aortic coarctation causes ...
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1answer
77 views

why dead mouse doesn't bleed when we cut their skin?

When we are pricked by a needle, we bleed nevertheless it's so small wound. But when we do mouse anatomy, it doesn't bleed even if we cut their whole abdominal skin. Other student asked about that, ...
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29 views

What terms or concepts are used to describe the morning metabolic phenomenon involving glucocorticoids, glucose, and blood pressure?

A recent conference report described using a vaccine-based strategy to blunt a surge of high blood pressure that occurs between 5 and 8 a.m. Apparently most heart attacks and strokes occur during ...
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2answers
508 views

Difference between pulse and blood pressure

I'm a very naive and biologically illiterate person, and from what I've read on the internet I'm not really sure I understand the difference between pulse and ...
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111 views

Why does high blood pressure not damage the body during exercise?

Exercise is commonly understood to lower blood pressure by making the heart stronger. Mayo Clinic says, Regular physical activity makes your heart stronger. A stronger heart can pump more blood with ...
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Exsanguination Time from Damage to Major Arteries

For a game project, I need to study how much blood loss is suffered when the major arteries of the human body are severed. I believe there are medical textbooks that have collected data on blood ...
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42 views

Why does the formula for blood velocity hold true?

v = Q/A where v = velocity (cm/s) Q = blood flow (ml/s) A = cross sectional area (cm2) So the greater the cros sectional area, the lower the velocity, assuming that the cardiac output is a constant ...
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Will renal blood flow decrease in response to dehydration?

If dehydrated, does the correction of ECF osmolarity happen slowly enough for ECF (and therefore plasma) volume to be temporarily depleted and therefore reduce renal blood flow? If dehydration is ...
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1answer
39 views

Consequences of abnormal blood pressure unrelated to cardiac output?

A question from Kaplan's MCAT Biology Review asks: In bacterial sepsis (overwhelming bloodstream infection), a number of capillary beds throughout the body open simultaneously. What effect would this ...
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28 views

The blood pressure when blood comes out of body

Is there any certain amount of pressure difference between our blood pressure and barometric pressure when blood of our body begins to come out?
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Can severe vasoconstriction increase systolic blood pressure?

I know that, vasoconstriction results in increased total peripheral resistance which is responsible for the rise in diastolic blood pressure. Also, cardiac output is responsible for the systolic blood ...
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Relationship between blood pressure time series and ventricular dynamics of the heart

The answer to this question is probably very straightforward, but I have actually had some difficulty finding an explicit answer online. To what extent does the oscillatory pattern of arterial blood ...
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235 views

Why do arteries have a small lumen? [closed]

My biology textbook says that arteries have a small lumen relative to the thickness of their walls. I understand why they need thick walls, to withstand high pressure and stretch etc. But when ...
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29 views

Edema and hydrostatic pressure

I'm currently studying Robbins basic pathology, and I'm confused about a specific statement: It states in the book that when hydrostatic pressure is low due to a lack of albumin synthesis, it leads ...
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1answer
67 views

Why is angiotensin converting enzyme localized in the lungs

I understand that it's also found elsewhere, such as in renal capillaries, but I can't see logic behind it being located in the lungs. Isn't ACE's function, through making more angiotensin II, causing ...
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29 views

Why does a stronger heart cause blood pressure go down

Intuitively, why does a stronger heart cause blood pressure to go down? The answers I've found from a cursory google search seem to indicate that it has to "work less hard" to pump the blood and that ...
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26 views

Vasoconstriction and blood flow

The resistance in a blood vessel is equal to the pressure difference divided by the blood flow. Let us now say that a sympathomimetic causes vasoconstriction which increases the resistance. Does this ...
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How does sodium ion increase blood pressure?

So I have been reading about the RAAS system and I was wondering how natrium (sodium ) ions increase blood pressure.I have been looking up on the internet and have yet to find an answer.Help
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390 views

Cardiac cycle and atrial contraction

During atrial contraction ("a" in the figure), why does the ventricular pressure match the atrial pressure? The ventricular pressure generally stays the same throughout passive filling until it ...
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50 views

In oscillometric blood pressure measurement, why do we assume that highest oscillations correspond with mean arterial pressure?

As far as I've seen, the point on the oscillometric curve where there are greatest oscillations represents the mean arterial pressure (MAP). My question is - why? What is the logic behind this ...
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1answer
53 views

Will being very muscular (to the point that one is characterised as obese by BMI) increase blood pressure?

It is widely accepted that obesity/overweight (which I believe refers to people with a high amount of fat cells instead of bodybuilders who weigh a lot due to lots of muscle cells) have higher blood ...
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1answer
28k views

Arm at Heart Level when Measuring Blood Pressure

How come that one's arm has to be at heart level so that the blood pressure can be measured accurately. I've tried researching this question, but most answers to it were just "if the arm is above the ...
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76 views

Is lowered blood pressure a primary lethal symptom of an opiate overdose?

When someone has a opiate overdose, they can have no or almost no pulse and can have shallow breathing or stop breathing. When you stop breathing (for example) by drowning, you can survive for a long ...
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64 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
147 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
653 views

Why does weight loss lower blood pressure?

I have read that weight loss is an effective lifestyle modification for people with hypertension, and systolic pressure may be reduced by up to 1-2 mmHg for every 1kg of weight lost. What is the ...
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119 views

Is the molecule nitric oxide responsible for healing blood vessels?

Is the molecule nitric oxide responsible for healing blood vessels? How does nitric oxide heal the blood vessels? I watched a documentary about the healing effects of nitric oxide. In the video I saw ...
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1answer
157 views

What could an increase in systolic blood pressure and decrease in diastolic mean?

Sorry if this is a really simple question but my academic background is in completely different sciences. I recently made a computer game for an experiment that was related to anxiety and relaxation. ...
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1answer
4k views

Osmotic Pressure in Capillaries [closed]

In this diagram, D is apparently the point at which "the osmotic pressure into the capillaries is the greatest", but I cannot figure out why. Any help would be much appreciated!
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1answer
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How are the paranasal sinuses linked with the capillaries in the ear canals?

Sinus congestion often seems to be accompanied by excess pressure on the outer ears (as anyone who has shared a transcontinental flight with an infant can attest to) or fluid buildup in the canals. ...
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1answer
101 views

How can potassium rich foods reduce blood pressure?

How come sodium increases blood pressure, but potassium, which has to some extent similar properties helps lower it?
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75 views

Physiological Effect of Mannitol

Which Starling Force is affected by Mannitol? I am either thinking hydrostatic pressure of interstitial fluid (because it increases interstitial fluid volume) or hydrostatic pressure of capillary (...
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1answer
202 views

Is a one ventricle heart feasible?

So this is derived from a lesson at Khan Academy. The mind activity assumes that the one ventricle heart pumps blood to the lungs for oxygenation then rest of the body. However, the problem is that ...
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1answer
336 views

How are limits determined for systotic and diastotic blood pressure?

I know that the upper limits for systotic/diastotic blood pressure are 120/80. What is the mathematics behind these numbers? I am curious because I did not find information regarding how the numbers ...
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1answer
649 views

High Blood Pressure - Na or NaCl? [closed]

What is the cause of high blood pressure? or, Which foods can cause high blood pressure? Is it just sodium, or sodium chloride? I'm confused because sodium chloride should ionise in the aqueous ...
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2answers
2k views

How does the mechanism which controls blood pressure in the brain work?

I know that pressure is sensed in the skin by mechanoreception mediated by skin receptors. Static pressure stimuli are mainly sensed by slow-adapting fibers connected to receptors like the Merkel ...
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1answer
17k views

What is the normal blood water content

What is the normal water volume per 1 L of blood, and how much deviation from that norm causes dehydration or hyponatremia?
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1answer
733 views

Why do people perceive blood pressure as the force that moves the blood forwards (see details)?

For example "Veins contain a lot of valves because the blood pressure inside them is low.". This wouldn't make any sense unless if blood pressure was perceived as the force that drives the blood ...
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1answer
290 views

Blood pressure measurement

When measuring your blood pressure in your arm, when you hear the sound to measure the systolic, is that sound NOT the heartbeat?
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92 views

Does capillary blood pressure have any effect on how much oxygen or nutrient gets distributed to tissues?

From what I have read regarding blood pressure and blood flow, I've come to the conclusion that, apart from the osmolarity of blood, the only determinant of how much oxygen/nutrients the tissues get ...
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1answer
75k views

Blood Pressure: Significance of difference between systolic and diastolic

I wanted to understand what is the difference between systolic and diastolic readings of blood pressure. I understand 120-80 to about 100-60 is considered normal but does the difference in the two ...
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1answer
3k views

Why do changes in preload not cause changes in end systolic pressure?

I am trying to understand why changes in preload do not cause concomitant changes in end systolic pressure. If you have preload enhancement than this should lead to an increase in cardiac output.....
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1answer
319 views

Why is it always Sodium that we talk of in blood pressure?

Why is that we emphasize so much on sodium in blood pressure? I understand that it is a major extracellular ion, but, it also is tightly regulated. So when something is that tightly regulated, won't ...
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335 views

Saturation vapor pressure effect on human body [closed]

I found this calculator: http://www.decatur.de/javascript/dew/ It calculates the dew point based on temperature and humidity. In the result it is mentioned the saturation vapor pressure. I barely ...