Which statements describe the movement of blood through the heart? check all that apply.

blood from the veins enters the ventricles.

atria and ventricles contract at the same time.

atria push blood into the ventricles.

valves allow for two-way blood flow.

ventricles push blood out of the heart.

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.