3) Smooth muscle contraction is regulated by: a) activation (excitation) of myosin. b) availability of binding sites on actin. c) phosphorylation of calmodulin. d) pre-contraction length of the myocyte.

What is the role of calcium in muscle contractions? Multiple Choice   a) To spread the action potential through the T-tubules   b) To bind with troponin, changing its shape so that binding sites on the actin filament are exposed   c) To transmit the action potential across the neuromuscular junction   d) To re-establish the polarization of the plasma's membrane following an action potential   e) To break the cross-bridges as a cofactor in the hydrolysis of ATP

Pick the right order for muscle contraction a) ATP attaches to myosin, muscle cell uses calcium, action potential spreads b) Calcium release, binding sites on actin are exposedmyosin binds to actin c) Myosin binds to actin, myosin uses calcium, cell gets shorter d) Action potential is received , cell gets shorter, myosin grabs actin

Describe how each of the following factors influences motor unit recruitment: a) Increasing contraction speed b) Increasing force output c) Increasing fatigue

If you completely stopped working out for 6 months, the following would occur: O a) a decrease in muscle fiber type O b) an increase in muscle fiber size O c) an increase in muscle fiber number O d) a decrease in muscle fiber size

Please answer all questions  Following death, muscles enter a period of sustained contraction called rigor mortis. This develops because: a) the Na+/K+ active transport pump fails. b) there isn't any more neurotransmitter secretion. c) there isn't any ATP to break actin-myosin bonds. d) calcium is not returned to the cisternae. If a muscle is stimulated to contract at maximum tension yet brief periods of relaxation are possible, the muscle is demonstrating: a) twitch. b) summation. c) incomplete tetany. d) complete tetany.

As the frequency of stimuli increases, individual twitches begin to build on each other in the phase: A) latent phase B) relaxation phase C) incomplete tetanus D) rigor mortis

Which of the following statements is unique to skeletal muscle? O a) skeletal muscle has striations O b) skeletal muscle is attached to bones O c) skeletal muscle is under voluntary control O d) skeletal muscle is multinucleated O all of the above O b, c, & d but not a

26) muscle tone is .... a) the ability of a muscle to efficiently cause skeletal movements  b) the feeling of well being following exercise  c) the condition of athletes after intensive training  d) a state of sustained partial contraction

Crossbridges that form during muscle contraction are a bond between:   A. Myoglobin and Troponin B. Hemoglobin and Glycogen C. Actin and Myosin D. Toponin and Tropomyosin