True,all forms of aerobic activity can promote cardio respiratory fitness.
Answer:
your answer would be sinus node (also called the sinoatrial node, or SA node).
Explanation:
The circulatory system is very useful. This system transports the food nutrients, and oxygen to the body cells. It also delivers of carbon dioxide and waste products. This helps the respiratory system by transporting nutrients to keep the lungs clean, and healthy.
The symbol for gold is Au
