How are antibodies and T-cells related? T-cells produce antibodies.
Antibodies produce T-cells.
Antibodies and T-cells are both immune cells.
Antibodies and T-cells are both generated by the lymphatic system.

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.

Answer sweat and vasodilation;