5 Some students were asked to identify which cells contain the greatest number of mitochondria. They were given the following choices: blood, epidermal, cardiac, and
nerve cells. Which of the following is the best response?
A Blood cells, because they must carry oxygen throughout the body all the time,
which requires energy.
B Nerve cells, because energy is needed to relay messages throughout the body
C Cardiac muscle cells, because the heart must work all the time, requiring constant
energy.
D Epidermal cells, because the skin must constantly grow new skin cells, which
requires energy.