The membrane of a contractile cardiac muscle cell contains
A. calcium pumps that move calcium out of the cell.
B. calcium pumps that open and allow calcium to diffuse down its concentration gradient to reach equilibrium.
C. no calcium pumps.
D. calcium pumps that move calcium into the cell.
Answer: A
You might also like to view...
When a muscle relaxes,
A. crossbridges form and muscle extensibility returns the muscle to rest length. B. crossbridges form and muscle elasticity returns the muscle to rest length. C. crossbridges stop forming and muscle elasticity returns the muscle to rest length. D. crossbridges stop forming and muscle extensibility returns the muscle to rest length
A(n) ________________________________________ is removal of all or part of a limb or body part
Fill in the blank(s) with correct word
When a person is chewing food, the concentration of ions in saliva changes with:
A. a decrease in Na+, Cl-, and HCO3- B. a decrease in Na+, Cl-, and an increase in HCO3- C. a decrease in K+ and Na+ D. an increase in Na+, Cl-, and HCO3- E. a decrease in K+ and HCO3-
What process provides most of a muscle's ATP?
A. Cellular respiration B. Lactic acid fermentation C. Alcoholic fermentation D. Creatine phosphate breakdown