1. how many chambers does the human heart have? 2. what close the valves in the heart and why should they do this?

3. what do we call a pulse?

4. describe blood capillaries

Your heart has four separate chambers that pump blood, two on the right side and two on the left.

2. When the ventricle relaxes, the aortic valve closes to prevent blood from flowing back into the ventricle. When the aortic valve is not working properly, it can interfere with blood flow and cause the heart to strain to send blood to the rest of the body.

3. In medicine, a person's pulse is a pressure wave caused by the expansion of the arteries as a result of the circulation of blood pumped by the heart.

4. Capillaries are tiny vessels that branch out from arterioles to form networks around body cells.

Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them.

hope this help! ^^

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.

"it built up in the atmosphere"

i think thats it, idk, i tried looking for this exact q& a for grad. and idk if i got this question right or sorry if im wrong