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

Explain why methicillin resistant staphlococcus aureus (mrsa) is more prevalent now than it was only 30 years ago. a. antibiotics cause mutations in staphlococcus aureus that lead to an increase in the number of methicillin-resistant strains. b. methicillin resistance causes an infection to spread more rapidly.c. frequent and inappropriate use of methicillin-type antibiotics has provided selective pressure that has resulted in an increase in the proportion of methicillin-resistant strains of staphlococcus aureus.d. diseases like aids have made people more vulnerable to infections from staphlococcus aureus.