Exam 8: Muscle Physiology

____________________ refers to paralysis of the legs resulting from lower spinal cord injury.

____________________ proteins function as calcium-release channels in the muscle cell.

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 -Contraction is triggered as Ca²⁺ causes troponin to move tropomyosin from its blocking position over actin's binding sites for the cross bridges

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 -Thick and thin filaments are highly organized into a banding pattern

Denervated muscle fibers become progressively smaller and their content of actin and myosin decreases.

Z lines

A skeletal muscle produces motion by pulling the origin toward its insertion.

Cross bridge interaction between actin and myosin in skeletal muscle is directly blocked by

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 -Shortens during muscle contraction

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 designed for endurance

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

The H zone

Slow-oxidative muscle fibers have high resistance to fatigue.

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 -Spherical

Match muscle term with the correct characteristic. a.a storage form of glucose used in muscle cells requiring rapid energy release b.a molecule that can quickly provide materials to make ATP c.an oxygen-storing protein that makes muscle tissue appear red d.a fuel molecule for cell respiration or fermentation e.a fermentation product when our cells become anaerobic -Creatine phosphate

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 -Myosin must be phosphorylated before it can bind with actin

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 -Basis of contraction is cross bridge interaction between actin and myosin

The work performed by a muscle is the force it develops divided by distance.

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 -Can bind with myosin during muscle contraction

Twitch summation