Exam 8: Muscle Physiology

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 I band

A lack of ATP in a contracted skeletal muscle cell would most likely cause

The heart initiates its own action potentials without any external stimulation.

An action potential rapidly spreads to the central portions of a muscle cell by means of

Order the following muscle cell components from larger to smaller 1)troponin 2)myofibril 3)sarcomere 4)thin filament 5)muscle fiber

Muscle relaxation does not take place until all of the ATP is used up.

Summation events result from increasing amounts of cytoplasmic calcium levels.

The functional unit of skeletal muscle

The corticospinal system

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 -Important in maintaining posture

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 -Load exceeds muscle tension

During muscle contraction,

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 under voluntary control

Tetanus occurs when a muscle fiber is stimulated so rapidly that it is not allowed to relax between stimulations, resulting in a smooth, sustained contraction.

Single-unit smooth muscle

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 heart

Fast-oxidative muscle fibers have a high concentration of mitochondria.

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 -Maintains a constant resting membrane potential unless stimulated

Intrafusal muscle fibers