Help! this is due today!!
1) Why do muscle cells have so many mitochondria?
A: The mitochondria in muscle cells are smaller so more are needed.
B: Muscle cells are bigger than every other cell and can fit more mitochondria.
C: There are more mitochondria only because there are more nuclei.
D: Muscle cells need to quickly respond to energy needs.
2) What is the effect when a muscle contracts? *
A: The muscle pushes on another muscle.
B: The muscle pushes on a bone.
C: The muscle lengthens.
D: The muscle shortens.
4) Which of the following is stored in the skeletal system?
A: potassium
B: calcium
C: sodium
D: water