Respuesta :
At a given hydrostatic pressure and a given pressure head, the tension within the wall of a blood vessel will _____decrease___ and the blood flow will ____increase____ as the diameter of that vessel increases.
Cardiac output measures how much blood the heart pumps in a minute. It is computed by multiplying the stroke volume by the number of heartbeats per minute (heart rate) (the volume of blood pumped into the aorta per contraction of the left ventricle). As a result, raising heart rate during exercise can enhance cardiac output.
However, increasing the stroke volume, as would happen if the heart contracts more forcefully, is another way to enhance cardiac output. Increasing blood flow through the body more quickly can potentially increase the volume of a stroke by allowing more blood to enter the heart between contractions. Heavy exercise causes the blood vessels to relax and expand, which balances the increased heart rate and ensures that enough oxygenated blood gets to the muscles.
Stress results in a reduction in blood vessel diameter, which raises blood pressure. Blood pressure variations can also be brought on by hormones or nerve signals, and even simple actions like rising up or lying down can significantly affect blood pressure.
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