AP BIOLOGY

Detailed explanation-1: -Plasma is made primarily of water. Many of the molecules the body needs to transport, such as urea, carbon dioxide and glucose, are soluble in water. This means that a large number of substances can be transported around the body in plasma at any one time.

Detailed explanation-2: -Plasma carries water, salts and enzymes. The main role of plasma is to take nutrients, hormones, and proteins to the parts of the body that need it. Cells also put their waste products into the plasma. The plasma then helps remove this waste from the body.

Detailed explanation-3: -Describe and explain how substances dissolved in blood plasma, such as oxygen and glucose enter the tissue fluid from the capillaries. Simple molecules are able to move through the capillaries down the concentration gradient. An example of this would be oxygen moving from oxygen rich blood into the surrounding muscle.

Detailed explanation-4: -The digestive system The dissolved food molecules are transferred into the bloodstream at the small intestine by diffusion and other transport processes. Once the dissolved food molecules are in the bloodstream, they can be transported to all the cells in the body.

Detailed explanation-5: -Blood plasma is obtained by centrifuging whole blood donations or by plasma apheresis.