The factor(s) that determine the duration of a twitch in various types of fibers is the speed of the a. removal of ca2+ ions from the sarcoplasm only. b. hydrolysis of atp only. c. movement of na+ across their membranes only. d. removal of ca2+ ions from the sarcoplasm and hydrolysis of atp. e. removal of ca2+ ions from the sarcoplasm and hydrolysis of atp and movement of na+ across their membranes.

After frida stops exercising, she continues to breathe heavily. what is most likely occurring in her body? heavy breathing during exercise has produced an oxygen surplus in her muscles. this oxygen is being transported to her lungs. this is a result of aerobic respiration. heavy breathing during exercise has produced a carbon dioxide surplus in her muscles. lactate is being transported to her liver. this is a result of aerobic respiration. strenuous exercise has caused her body to be in carbon dioxide debt, and she is breathing hard while lactate is transported to the liver. this is a result of anaerobic respiration. strenuous exercise has caused her body to be in oxygen debt, and she is breathing hard while lactate is transported to the liver. this is a result of anaerobic respiration.