(2) Ventricular contraction, which means that the blood enters another way of blood circulation-_ _ _ _ _ _ pulmonary circulation to obtain oxygen. Blood carrying nutrients and oxygen enters the heart again.
(3) Then, under the pressure of ventricular contraction, blood enters the aorta, and is transported to the capillaries of the brain through the blood vessels branching to the head, where it exchanges substances with brain tissue cells.
(4) Glucose and oxygen obtained by brain cells participate in respiration in the mitochondria of cells, releasing energy, thus alleviating Qin Li's symptoms.
Explanation:
1. Glucose is absorbed in the villous epithelial cells of the small intestine and then enters the blood, and the blood passes through the small intestine through gas exchange, with low oxygen content and becomes venous blood. Venous blood in the lower body is injected into the right ventricle through the inferior vena cava.
2. Subsequently, blood enters the right ventricle from the right atrium and is transported to the lungs, that is, pulmonary circulation begins.
3. The blood after pulmonary circulation enters the left atrium, then the left ventricle, and then enters the aorta through ventricular contraction and is transported to the whole body.
4. Breathing occurs in the mitochondria of cells, releasing energy for cells to use.