Which process involves both passive and active transport?

1. Ans. a.) facilitated diffusion

Facilitated diffusion is basically using natural forces to transport wastes and nutrients in between cells in capillaries and muscle tissues. This does both passive and active transport because the cells must be pumped by the heart (which is active because energy in the form of ATP is being used), but it is also passive, because the natural force of diffusion (which is the natural ability of a liquid to spead out as far as possible, seeking low-pressure areas) does all the work, which is known as passive transport, because it is not spending any energy.


2. Ans. c.) It stores sugar as glycogen.

When the concentration of glucose in the blood is high, such as during and immediately after a meal, the pancreas releases the hormone insulin into the bloodstream. Insulin delivers two different messages to various body cells to cause the level of glucose in the blood to fall. First, insulin directs the liver to store the glucose as glycogen. Second, insulin directs muscle, adipose, and other cells to remove glucose from the bloodstream by taking it into those cells. By triggering both glycogen synthesis in the liver and glucose movement out of the bloodstream into certain cells, insulin keeps the concentration of glucose from rising too high in the blood