At the end of repolarization, the newly opened channels for ____________________ ions close
Fill in the blank(s) with correct word
K+
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In a laboratory experiment you have treated a muscle cell with a calcium channel blocker. The membrane still depolarizes, but the concentration of calcium never increases in the cytosol. Which of the following describes what will happen next?
A. Contraction will occur, but the muscle will be stuck in the contracted state and unable to relax. B. Tropomyosin will continue to cover the myosin binding sites on actin and no cross-bridges will form. C. Only one cross-bridge cycle will occur but no second cycle. D. Binding of myosin to actin will take place. E. A single twitch in skeletal muscle but no sustained contraction.
As part of which nervous system do postganglionic neurons release norepinephrine?
a. parasympathetic nervous system b. sympathetic nervous system c. both the parasympathetic and sympathetic nervous systems
Blood serum is essentially the same as blood plasma, except that plasma contains __________ and serum does not.
A. platelets B. nitrogenous wastes C. fibrinogen D. glucose E. albumin
Horses can kick in any direction
Indicate whether the statement is true or false