Answer:
alveoli are the air sacks present in lungs they constitute the whole surface of the respiratory system the pulmonary artery from the heart containing deoxygenated blood enters the lungs and this deoxygenated blood is then oxidized by alveoli.
Nephron is the basic structural and functional unit of kidney.The function of nephron is removing all waste products including the solid wastes in the form of feaces, and other excess water from the blood, converting blood into the urine, reabsorption, secretion, and excretion of numerous substances.
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