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6 votes
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Heart rate vs body size

The paper you link finds that there is not a significant correlation between body mass and resting heart rate in humans. While there is a well known negative correlation across mammals: This is the ...
kmm's user avatar
  • 12.3k
3 votes
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How does heart beat faster while doing a strenuous task?

I am sure that there are many ways that your body can regulate heart rate, but I am going to cover this topic briefly from the perspective of $\ce{CO2}$/$\ce{O2}$ concentrations, and pH. The medulla ...
Bob's user avatar
  • 556
2 votes
Accepted

Cardiac cycle and atrial contraction

While blood is flowing into the ventricle, it can never be at a higher pressure than where blood is flowing from: if it was, the flow would be going in the other direction. Flow is always from higher ...
Bryan Krause's user avatar
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2 votes
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Why is mean systemic filling pressure used to calculate pressure differential for venous return?

I think the words tripping you up are "mean" and "systemic". Specifically, it sounds like your intuition is that you should be thinking about an average (mean) across space, across ...
Bryan Krause's user avatar
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1 vote
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What's the amount of blood passing through heart every second at Max Heart Rate?

ยท Heart Beat Rate The normal heart has a rate of 72 beats per minute, but in infants the rate may be as high as 120 beats, and in children about 90 beats, per minute. Lets say the heart beats ...
EMX's user avatar
  • 146

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