Question 1
Calcium ions used for muscle contraction are stored in which part of the muscle cell?
◦ the nucleus
◦ the Golgi apparatus
◦ the sarcoplasmic reticulum
◦ the ribosomes
◦ the lysosomes
Question 2
During exercise, when energy from cellular respiration is depleted, the muscle cell relies on which substances for energy?
◦ glucose and glycogen
◦ glucose and fatty acids
◦ fatty acids and glycogen
◦ proteins
◦ fatty acids and lactic acid