The specific aerobic exercise is the most important factor if a person's goal is to increase his or her overall fitness. Aerobic exercises means "with oxygen" which will increase your heart rate while working out. Some of the specific aerobic exercises include brisk walking, swimming, running, also known as cardio workouts.
Answer:
A. They destroy antigens because they are a foreign object.
Smooth and cardiac are involuntary.
Skeletal is voluntary.
