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.

Which best describes carbon dioxide’s path out of the body

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

Which charactistic is a property of water ?