The tag has no usage guidance.

learn more… | top users | synonyms

-2
votes
0answers
26 views

How sympathetic system lead to an increase in GFR?

ADH is a vasopressin. It affects the kidney by its constrictive effect on blood vessels. This causes an increase in blood pressure. The sympathetic nervous system follows the same process to decrease ...
5
votes
1answer
85 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 ...
1
vote
2answers
54 views

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

I've heard that the blood pressure in the brain is organised by a special mechanism. What is that and how does it work?
0
votes
1answer
220 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?
2
votes
0answers
22 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 ...
2
votes
0answers
55 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 ...
4
votes
1answer
112 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 ...
1
vote
1answer
53 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?
6
votes
1answer
346 views

How does pressure measured by sphygmomanometer translate directly to blood pressure?

As per my understanding a sphygmomanometer when wrapped around the arm and inflated only measures the pressure of the air inside the cuff, doesn't it? How does that translate directly to the pressure ...
1
vote
1answer
102 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 ...
1
vote
1answer
5k 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 ...
8
votes
1answer
248 views

What creates the feeling of 'excess' blood pressure to an area of the body?

If I hang upside down, and feel blood rushing to my head, what structures are actually responsible for me "feeling" this excess flow of blood? Baroreceptors? Mechanoreceptors? Something else? ...
5
votes
1answer
397 views

How can heart disease cause dizziness after eating?

I have been reading several articles explaining dizziness after eating (see here and here), and both articles gloss over something that I found pretty remarkable. Both articles claim that "heart ...
0
votes
0answers
56 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 ...
2
votes
1answer
92 views

Why can blood vessel contraction be described as a second order system?

Suppose that the x-axis represents time, and the y-axis vessel diameter. Then this graph is claimed to roughly describe what happens when the blood pressure increases, then decreases. When the ...
1
vote
1answer
50 views

Specialist evaluation for people aged under 40 years with stage 1 hypertension

Reading the NICE clinical guideline for Hypertension it says... For people aged under 40 years with stage 1 hypertension and no evidence of target organ damage, cardiovascular disease, renal ...
3
votes
1answer
144 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 ...
0
votes
1answer
9 views

What studies are there showing the effectiveness of any substance on canine hypertension?

Searching on http://www.ncbi.nlm.nih.gov I could only find the article titled as "Telmisartan Treatment of Refractory Proteinuria in a Dog".
4
votes
1answer
41 views

Thrombus and Embolii

Can treatment of thrombus cause embolism, in case of very high blood pressure, that may even lead to a heart attack ? As the very high Blood pressure may cause some of the enzymes not act completely ...
1
vote
1answer
110 views

People say the cardiac cycle depends on blood pressure? How so?

I know what the cardiac cycle is. There are two phases diastole and systole. One is the relaxed, and the other is the contracted form of the heart. The diastole is where blood is pumped to the ...
1
vote
1answer
278 views

What is the blood ejection speed outward from human body vein? [closed]

At what height blood can eject from human vein ? I see, sometime there is direct blood transfer from one person to patient. So sometime blood bottle is kept at certain height and blood is transfered ...
1
vote
0answers
74 views

How do cellphones calculate heart rate?

How do cellphones calculate heart rate ? I understand that the cameras there try to count undulation in blood flow, but is the method of calculation same as that of professional SpO2 monitors ?
0
votes
1answer
459 views

Can too low oncotic pressure lead to Third spacing and Edema?

I know that low oncotic pressure is associated with many pathologies. I am interested how it is associated with Third spacing. My professor says that it can permit edema formation. The opposing ...
9
votes
2answers
34k 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 ...
2
votes
1answer
58k views

Blood pressure difference while seated and laid down [closed]

My blood pressure readings differ a lot when I read them while seated and while I lay down on a bed. I tie the strap in both cases to my left bicep and rest for a minute before noting the readings ...
2
votes
1answer
13k views

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. ...
0
votes
2answers
168 views

Blood circulation and blood pressure in different tissues [closed]

The volume of blood coursing the blood circulation is approximately five litres. A typical vein will stretch about eight times as much as corresponding artery. Because veins have high capacitance, ...