REMEDIAL TEST "BBI"

REMEDIAL TEST BBI

Luvia Berlydianti
XII Science 3
22

Guys, do a little research with me! Put the palm of your hand on your chest. Do you feel something beating? Yes. It is your heart. We have known that heart pumps to produce fresh blood for all body tissues. However, do you know how heart pumps blood and circulate it to all body tissues?
As we talk, the heart ejects oxygen rich blood under high pressure out of the heart’s main pumping chamber, the left ventricle, through the largest artery, the aorta. Smaller arteries branch off from the aorta, leading to various parts of the body. These smaller arteries in turn branch out into even smaller arteries, called arterioles.
Capillaries have extremely thin walls that permit dissolved oxygen and nutrients from the blood to diffuse across to a fluid, known as interstitial fluid that fills the gaps between the cells of tissues or organs. The dissolved oxygen and nutrients than enter the cells from the interstitial fluid by diffusion across the cell membranes. In this way, the blood delivers nutrients and removes wastes without leaving the capillary tube.
After delivering oxygen to tissues, the deoxygenated blood in capillaries then starts the return trip to the heart.