Question

1. which organ in the human body contains the most mitochondria because of its constant energy demand?

a. liver
b. skin
c. heart
d. kidney

Explanation:

Mitochondria are the powerhouses of the cell, producing energy (ATP). The heart muscle (cardiac muscle) contracts continuously throughout life, requiring a massive and constant supply of energy. The heart has a very high energy demand to maintain its rhythmic contractions. The liver has metabolic functions but not as constant a high energy demand as the heart. The skin is mainly for protection, sensation, etc., with lower energy needs. Kidneys filter blood but their energy demand is less than the heart's. So the heart has the most mitochondria due to its constant high energy demand.

Answer:

c. Heart