Exam 8: Muscle Physiology

Which region(s) marked by arrows or brackets do not change length during normal contraction and relaxation of the muscle fiber? ____

Actin

Match the sarcomere component with the correct characteristic. a.Z line b.A band c.I band d.H zone -Dark band

During aerobic exercise, the primary means for ATP production in muscle fibers involves

The corticospinal system controls fine, discrete, voluntary body movements.

Repaying the oxygen deficit after strenuous exercise involves

Sarcomeres are arranged end to end as

In the body's lever systems, the fulcrums are represented by the

The regulation of smooth muscle contraction is mediated by the phosphorylation of ____ in response to calcium binding to ____.

Part of the excess postexercise oxygen consumption is due to increased speed of chemical reactions resulting from an increase in body temperature.

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below: a.skeletal muscle only b.single-unit smooth muscle only c.cardiac muscle only d.skeletal muscle and cardiac muscle e.skeletal muscle and single-unit smooth muscle f.single-unit smooth muscle and cardiac muscle g.skeletal, single-unit smooth, and cardiac muscles -Contains actin, myosin, troponin, and tropomyosin

Muscle tension does not change in isometric contractions.

Smooth muscle can be classified as either _______ or _______, depending on its pattern of contractile activity and how its cytosolic Ca₂₊ increases

The major source of calcium in smooth muscle is from the ____________________.

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below: a.skeletal muscle only b.single-unit smooth muscle only c.cardiac muscle only d.skeletal muscle and cardiac muscle e.skeletal muscle and single-unit smooth muscle f.single-unit smooth muscle and cardiac muscle g.skeletal, single-unit smooth, and cardiac muscles -Contains T tubules

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below: a.skeletal muscle only b.single-unit smooth muscle only c.cardiac muscle only d.skeletal muscle and cardiac muscle e.skeletal muscle and single-unit smooth muscle f.single-unit smooth muscle and cardiac muscle g.skeletal, single-unit smooth, and cardiac muscles -Is found in the walls of hollow organs such as the stomach

Indicate the characteristics of the muscle-tension receptors using the following answer code: a.muscle spindle b.Golgi tendon organ c.both of these receptors -Is involved in negative feedback

Choose the false statement about smooth muscle.

Fast-glycolytic (type IIx) muscle fibers

During contraction, asynchronous cycling of cross bridges