Questions tagged [heart-output]

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What's the evolutionary purpose of having hearts?

According to this New understanding of heart evolution Humans, like other warm-blooded animals, expend a lot of energy and need a lot of oxygen. Our four-chambered hearts make this possible. It ...
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1answer
60 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 ...
7
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1answer
1k views

Heart rate vs body size

It is known that large animals have lower heart rates (beats per minute) than small animals. Is it the same situation in humans? That is: if we have a group women, about the same age and fitness, ...
0
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1answer
189 views

What's the amount of blood passing through heart every second at Max Heart Rate?

How many mL of blood passes through the heart every second at maximum heart rate? Is there any formula to calculate the amount of blood flowing through the heart per sec at say for example 70% of the ...
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0answers
23 views

Pressure on the heart

Is there more pressure on the heart when lying down flat as opposed to lying down with head and knees slightly elevated? Also is there more pressure on the heart standing up as opposed to lying down ...
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2answers
459 views

How does heart beat faster while doing a strenuous task?

I know that when we do tasks which require extra physical effort (like running etc.), our heart beats faster. I also know that the reason behind this is that these jobs require more energy than usual ...
2
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0answers
152 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
169 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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1answer
4k views

Is an athlete's heart rate after exercise greater than a non-athlete [closed]

I was just wondering And if it is greater or lower how does this benefit an athlete Also what is the averaged number of heart beats per minute
24
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1answer
10k 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?
4
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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
159 views

Who is organizing the heartbeat and its roles in the body?

Throughout the decades we heard that the heart is the only muscle whose nervous system is not acting. So who is he responsible for organising the heartbeat and its roles?
4
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1answer
520 views

How can we measure cardiac output?

I could find a way which could find it by body oxygen consumption and there is another way to measure it by injecting drugs — measuring cardiac output by the so-called “indicator dilution method,” a ...