Why does your heart never tire of constantly beating to pump blood throughout your body?

it belongs to the skeletal muscle group, which means it moves involuntarily.

it consists of fibers that move voluntarily, so you can train these fibers to increase their endurance level.

it has a high level of muscular strength due to extensive weight training.

it consists of cardiac muscle tissues, which means it moves involuntarily.

When do people generally experience rapid growth for a second time? a. between the ages of 3 and 9 b. between the ages of 9 and 12 c. between the ages of 13 and 20 d. between the ages of 25 and 29 which action occurs in the third stage of cell division? a. the nuclear material of cell is copied exactly. b. the nuclear membrane disappears. c. the cell forms two nuclei d. the nuclear material separates, with half moving to either side of the cell.