Questions tagged [cardiology]

The study of the physiology and pathology of the heart and the cardiovascular system.

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0answers
64 views

Different number of flaps in heart valves

Can anyone tell me why the different valves of heart have different number of flaps is it in any way related to evolution of homo sapiens.
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2answers
74 views

Isolating the vasculature of an organ?

Is there a chemical or process that would dissolve or remove all other tissues in an organ and leave all the vasculature intact? I am planning to make a shelf display of the blood vessels in the heart ...
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0answers
206 views

Why does fetal distress (hypoxia) cause bradycardia?

In a non stress test performed in the labor room, fetal bradycardia is a danger sign indicating fetal distress (hypoxia). Why does fetal hypoxia cause bradycardia while hypoxia in adults cause ...
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1answer
126 views

A hypothetical emergency situation

This question was posed to me by my Biology teacher: Consider a hypothetical emergency situation of a person shot by a bullet in the heart. The bullet goes into the body and comes out from it, ...
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2answers
442 views

What causes the cardiac ventricular pressure change during the isovolumetric part of the cardiac cycle ?

Why does the cardiac ventricular pressure change during isovolumetric contraction and relaxation. The volume ( both valves are closed) is constant, Does Boyle's Law not apply? P1V1= P2V2 at constant ...
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38k views

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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1answer
716 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
46 views

Are these principles worth being validated? [closed]

Odunayo's principle of inhalation states that provided a given amount of water is ingested, inhalation through the nostrils will be excluded due to the presence of oxygen in the water. From the above ...
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0answers
167 views

Left Ventricle vs. Right Ventricle size in different Animals [closed]

Why are the right ventricles in chicken hearts significantly smaller than the left ventricles, whereas in cows the two ventricles are of roughly equal size.
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1answer
364 views

Which leads are abbreviated typically as channel ECG 1 and ECG 2?

I want make sure about the fact in the documentation of MIT-BIH NSRDB here. They just say ECG 1 and ECG 2 but not what particularly. I think they are the frontal plane channel and transverse plane ...
2
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1answer
38 views

Would a hole in a heart make it unsuitable for transplantation?

Would a hole in a heart instantly make it unsuitable for transplantation? Or could it be possible for a heart with a congenital defect to still be suitable for use is someone else's body?
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40 views

State of voltage gated sodium channels in depolarised potentials

Case 1 We learn in Physiology that during the depolarization phase in the membrane, more sodium channels tend to open as the membrane potential increases i.e., less negative. This is a kind of ...
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0answers
22 views

Why are valves preferentially affected in endocarditis?

The inside of the heart is covered by endothelium throughout. Why are valves predisposed to endocarditis? I know it can affect other structires like the septum, chordae etc. But why the valves? ...
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135 views

Evolutionary explanation of the bicuspid on the left and tricuspid on the right

The left heart handles more pressure and logically it would make sens to have a valve with three leafs on the left (If I had got to choose, I'd have put three on both sides). Other than being more ...
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2answers
522 views

Should heart-to-body energy consumption ratio equal oxygen consumption ratio?

The human heart pumps oxygen to the body, and the heart itself requires oxygen. Both the body and the heart use energy, usually expressed in calories or ergs. If we look at the energy consumption (...
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1answer
3k views

What is delayed compliance in blood vessels?

What I understand is it is a permanent stretch of the vessel wall. Is this true or does it mean something else?
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1answer
64 views

Atrial contraction in complete SA block

In a complete SA block when there's block of impulse from SA node to Atrial syncitium, The ventricles start pumping at AV nodal rhythm but how do the atria then contract?
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70 views

How much Cardiomyocyte Move in Relation to its Neurons?

I am trying to estimate how much cardiomyocyte and its things (mitochondria) move in relation to neurons Movement of neurons (1) Movement of cardiomyocytes Movement of cardiomyocytes' mitochondrias (...
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116 views

Plaque rupture flow chart reading

I am having a bit of trouble interpreting flow charts given in my biology question sets. Given the following stimulus The Question is : In which of the following options does each substance play ...
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5answers
10k views

How did the cardiovascular system evolve?

How has evolution created our blood, lungs and the heart? We can't exist without blood, which transports the oxygen to all areas of our body. However, the blood needs a lung, which gives it the ...
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1answer
194 views

Does the body have a mechanism for cleaning plaque buildup in arteries?

Is there a self synthesized substance in the body, or a mechanism that can break down plaque in arteries ?
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1answer
12k views

Can defibrillation be done with a car battery?

Can successful defibrillation be done with a car battery? Is it POSSIBLE for this to work? Let's say you are stuck on a very remote place and something happens to someone... Moreover, can you jump ...
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1answer
578 views

What is the relationship between stroke volume of blood and ventricular end-diastolic volume? [closed]

I do know what each term means. That is, i know that stroke volume is: the volume of blood pumped by each contraction of a ventricle, while ventricular end-diastolic volume is: the volume of blood in ...
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2answers
2k views

What is the cause that angina pectoris is felt in your left arm?

When someone has heart problems sometimes they feel pain in their left arm. But why is the left arm painful?
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2answers
2k views

Why are vegetations in Infective endocarditis common on the atrial side?

Robbin's Pathology says that vegetations of IE are more common on the atrial side in AV valves. In Liebmann Sack's Endocarditis, which is a sterile (non bacterial) type of endocarditis, the underside ...
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1answer
538 views

What is a lethal dose of THC?

With the oil form of THC being stronger then ever. What would happen if one was to take a stomach full of THC oil?
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0answers
23 views

How does the Sensitivity of Sokolow-Lyon indexes change by age?

I am studying the indicator and how diseases/age affect its sensitivity. However, no publication about it in PubMed and no luck in Escardio. How does the sensitivity of Sokolow-Lyon index and/or ...
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51 views

Pathogenesis of Cardiac Atypia?

I am studying the pathogenesis of atypia in cardiac cells where the etiology is most commonly irritation or infection and where the precancerous risk depends on the context of diagnosis. This fact ...
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1answer
139 views

Electrocardiogram: Difference between Atrial Fibrillation and Atrial Flutter

I have been working on analyzing Electrocardiogram data. I have read several documents related to conditions of the Atria during fibrillation and flutter, the most lucid being that atria quiver with ...
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1answer
180 views

Electrocardiogram: Missed beats in presence of Ectopic beats or Premature Atrial/Ventricular Contraction beats

I have been working on analyzing Electrocardiogram data. So far, i have identified Ectopic beats and Premature Atrial/Ventricular Contraction beats. I am working on identifying Missed Beat in the ...
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0answers
138 views

Average Beginning of Action Potential in ECG by t-f HRV

I have some ECG data where I am estimating the average beginning of the action potential. I am interested in the discrete Fourier analysis of joint t-f HRV when input data is ECG. Frequency domain ...
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1answer
11k views

What is the speed of blood?

The speed of blood may vary from one place to another and may be quite low in the tiniest vessels compared to the biggest one. What is the speed of blood while exiting a normal human heart?
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1answer
7k views

What is the function of the Moderator band?

The moderator band in the right ventricle is a band sorts of muscle which consists of a significant branch of the AV bundle. Does it mean it delivers impulses to the anterior papillary muscle faster? ...
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0answers
109 views

Determination of Ageing by ECG inclusions/exclusions?

I am studying ageing and considering ECG signal because of its high sensitivity in theory (escardio). Some factors Sensitivity Gender Medical treatment ... Benchmark: RTG dental + wrist uncertainty ...
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1answer
4k views

Is it possible to consciously increase or decrease your own heart beat? [closed]

By doing yoga, can we manipulate our own heart beat? Is that possible for humans?
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2answers
218 views

Persistent HPV and CVD in Women? [closed]

Cardiovascular disease is the number one morbidity factor of women. I am studying the relationship between persistent HPV infection and CVD (Cardiovascular Disease) in inadequate immune responses. ...
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1answer
2k views

How are isovolumetric contraction and afterload related in the cardiac cycle?

In the cardiac cycle isovolumetric contraction occurs and causes a pressure gradient. The "afterload" is the pressure exerted on the ventricle from the artery. Is the afterload the cause of ...
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39 views

Membrane conductance in phase 1 of the cardiac action potential

Correct me if I am wrong, but in phase 1 of the cardiac action potential (for ventricle cells) there is flow of potassium ions due to the opening of transdent potassium channels. To me this would ...
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1answer
117 views

How are cardiac cells stimulated by an action potential?

Why, and how, does the action potential of one cell in the heart stimulate an action potential in the next cell? I'm interested in an answer with citation.
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0answers
951 views

Why is there a structural difference between the bicuspid and tricuspid valve?

There are three cusps in the tricuspid valve and only two in the bicuspid valve? Why is there such a structural difference? Does it have anything to do with that there is oxygenated blood on the left ...
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0answers
646 views

Why do earthworms have 4 hearts?

I was reading about earthworms and came to know that they have 4 hearts. Why is there a need for a 4 heart system? What advantages would it have over a 1 heart circulatory system except for pumping ...
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0answers
280 views

Reasons for strange heart rate graph following exercise (line going up and down)?

Following a 2 minute general jumping and movement exercise designed to involve the entire body, the pulse was taken every minute for ten seconds. Strangely, the graph appears to jump up and down, for ...
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0answers
34 views

How can hyperplasia occur in non-fetal hypokinesis?

I have read that the hypoplasia can occur in fetal hypertrophic cardiomyocytes. However, I am interested if this can be theoretically be possible in non-fetal cardiomyocytes which are hypokinetic. I ...
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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
485 views

Is blood pressure in the aorta and brachial artery the same or different?

Does the blood pressure at the root of aorta equal the blood pressure in the brachial artery? I've heard it does, but it doesn't quite seem to make sense as I'd think the blood pressure would be ...
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0answers
81 views

Can bigger persons generally resist g-forces better?

I've seen a claim that bigger persons generally resist g-forces worse than smaller in an undergraduate biology book. However this claim was supported by the argument that blood has to travel a longer ...
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1answer
851 views

The heart of a Pigmy Shrew beats 1300 per minute then why is it so fast?

A pygmy shrew is such a small animal. Even with such fast heart beats their average life span is 1.5 years. So can we consider faster heartbeats to not be good for health?
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1answer
333 views

Cancer in myogenic heart cells? [duplicate]

Why cancer does not occur in myogenic heart cells? Is there any special ability in heart cells to resist cancer ?
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2answers
17k views

How does Bernoulli’s Principle apply to the cardiovascular system?

Below are graphs which illustrate the cross-sectional area, velocity, and fluid pressure through each vascular segment of the cardiovascular system. It makes sense that velocity and cross-sectional ...
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1answer
231 views

Physiology of tricuspid and bicuspid(mitral) valves

The tricuspid and bicuspid valves are atrioventricular valves. Both are valves that prevent backflow of blood pumped from the atria to the ventricles. However, the former has 3 "flaps" while the ...