Exam 8: Muscle Physiology

Thick filaments in skeletal muscle are composed of

Indicate which of the characteristics in question apply to each of the muscle fiber types by using the following answer code: a.Slow-oxidative fiber b.Fast-oxidative fiber c.Fast-glycolytic fiber d.Slow-oxidative fiber and fast-oxidative fiber e.Fast-oxidative fiber and fast-glycolytic fiber f.Slow-oxidative fiber, fast-oxidative fiber and fast-glycolytic fiber -Found predominantly in muscles adapted for short-duration, high-intensity activities

Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by writing the appropriate letters in the blanks using the answer code below: a.actin only b.myosin only c.actin and myosin d.troponin-tropomyosin complex e.actin, troponin, and tropomyosin f.actin, myosin, troponin, and tropomyosin -Found in the H zone

Which of the following is involved in muscle relaxation?

____________________ and ____________________ are referred to as contractile proteins, whereas ____________________ and ____________________ are referred to as regulatory proteins.

If the load on a muscle is increased, eventually a load will be reached at which the velocity of shortening becomes zero.At this point, the muscle contraction is referred to as

The ability of stretched smooth muscle to rearrange its cross bridge attachments so that muscle tension decreases is called the __________ response (a two-word answer)

The striated appearance of skeletal muscle is due to the

Skeletal muscle fibers are formed during embryonic development by the fusion of many smaller cells.

Stretch reflexes are important for

A function of tropomyosin is

Oxidative phosphorylation occurs within the mitochondria of muscle cells.

Enlargement of muscle due to weight lifting is primarily a result of

Of the steps in excitation-contraction below, which step occurs before the others?

A functional syncytium of cardiac muscles cells means that they

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 innervated by the autonomic nervous system

Indicate which bands are being described in each statement by writing the appropriate letter in the blank using the answer code below: a.A band b.I band c.H zone d.I band and H zone -Composed of thin filaments only

A special sensory receptor called a __________ lies within a muscle's tendon and respond to a change in muscle tension.

How does contraction of smooth muscle differ from that of skeletal muscle? Include the following in your answer: Ca²⁺ ions, troponin, tropomyosin, calmodulin, myosin-binding sites, light-chain region, actin, myosin, and cross bridge cycling.

In order for relaxation to occur, ACh must be removed from the muscle cell's receptors.