Exam 8: Muscle Physiology

Indicate which characteristic applies to the specific type of muscle contraction: a.isometric b.isotonic c.eccentric d.concentric e.isometric and eccentric f.isotonic and concentric g.isotonic, eccentric, and concentric -Length changes

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 -Most readily fatigues

During excitation-contraction coupling,

Considering muscles, bones, and joints as lever systems, a calculated "moment" for the load would be

The immediate source for supplying additional ATP at the onset of exercise is ____________________.

Indicate which characteristic applies to the specific type of muscle contraction: a.isometric b.isotonic c.eccentric d.concentric e.isometric and eccentric f.isotonic and concentric g.isotonic, eccentric, and concentric -Tension remains constant

The metabolic process called ____________________ (a two-word answer) provides the most ATP molecules for use by muscle fibers contracting over a long period of time.

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 -Regulatory protein(s)

Which of the following are involved in the regulation of cross bridge attachment activity?

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 thick filament

According to the sliding filament mechanism of muscle contraction, the thick filaments slide in closer together to shorten the sarcomere.

The muscle cells of a marathon runner's legs would exhibit all these characteristics except

The thick filaments within a myofibril have ATPase activity.

In smooth muscle, Ca²⁺ binds with the protein ____________________, which is structurally similar to troponin.

The first means by which ATP is produced at the onset of contractile activity is

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 -Form(s) a helical chain

Slow-oxidative muscle fibers would be found in high density in the leg muscles of Olympic sprinters.

Compare and contrast the different types of muscle contractions.Include the following in your answer: isotonic, concentric, eccentric, isometric, load, force, and tension.You may want to create a table as part of your answer.

During an isometric contraction, the muscle

Increasing the number of recruited motor units in a muscle increases its force or strength of contraction.