Answer:
C. take stairs instead of the elevator
Explanation:
i hope this helped sorry if im wrong
I think that the answer is thyroid gland x-rays
Answer: It enters the right atrium through the right ventricle.
Explanation: . The right ventricle pumps the blood to the lungs where it becomes oxygenated. The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium.