Question

give reason for this
please ​

Answer 1

Answer:

A) Oxygen and carbon dioxide travels to and from tiny air sacs in the lungs, through the walls of the capillaries, into the blood. Blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs. Blood leaves the heart through the aortic valve, into the aorta and to the body.

B) The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and rate in a healthy heart. Hence, the SA node is referred to as the natural pacemaker of the heart.

Explanation:

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Answer 2

Answer:

CO2 is rich blood because from all part of CO2 come to heart and it go left ventricle to left atrium to lungs .