To determine: Whether exercise increase or decrease venous return of blood and lymph.
Concept introduction: During breathing, the rhythmic pressure changes due to contraction and relaxation of the skeletal muscle of breathing. This cycle is known as the respiratory pump. The vigorous exercise demands more oxygen supply to produce more energy. Therefore, more blood enters the atria.
To determine: Whether the increase in blood return will affect the heart rate.
Concept introduction: During breathing, the rhythmic pressure changes due to contraction and relaxation of the skeletal muscle of breathing. This cycle is known as the respiratory pump. The vigorous exercise demands more oxygen supply to produce more energy. Therefore, more blood enters the atria.
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