Answer:
C
Explanation:
What causes blood pressure?
C
To pump blood around the body, the heart contracts and then relaxes through the cardiac cycle. The cycle begins with the contraction of the two atria, which push blood into the ventricles. Then, the ventricles contract, which forces the blood out of the heart.
When the heart pushes blood around the body during systole, the pressure placed on the vessels increases. This is called systolic pressure.
When the heart relaxes between beats and refills with blood, the blood pressure drops. This is called diastolic pressure.
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Answer:
C. Both
Explanation:
The movement of molecules from an area of high concentration to an area of low concentration is called <em>Diffusion.</em>
In simple difussion the movement of molecules is driven by a gradient in concentration in a solution or across a semipermeable membrane.
Unlike simple diffusion, in <em>facilitated diffusion</em> membranes incorporate specialized membrane proteins which help transport substances across the membrane, and also the direction of transport is always down a concentration gradient, from an area of high concentration to an area of low concentration.
