Exam 8: Muscle Physiology

To pick up something heavier than your pencil, your nervous system could

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

In a state of ____________________, a muscle cannot maintain any kind of tension.

Rigor mortis occurs when Ca²⁺ links actin and the myosin globular head together in a rigor complex.

Slow-wave potentials are common in multiunit smooth muscle located in the walls of organs in the digestive system.

The H zone of the sarcomere consists of myosin but does not contain actin.

Which of the following muscle types are myogenic?

Actin is not found in the parts labeled ___, ___, ___, ___, and ___.

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 -Used to accomplish movement

Sequence the following events involved in muscle cell contraction: 1)Sodium channels open and sodium flows in. 2)Impulse reaches the axon's terminal. 3)ACh binds to receptors on the muscle cell membrane. 4)Synaptic vesicles fuse with neuron's membrane and release ACh via exocytosis. 5)If enough sodium moves in to the muscle cell, an impulse (action potential) develops.

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 -Shape consists of two globular heads attached to a tail

Which statement is incorrect about cross bridges?

The region between two Z lines is a

During coactivation,

A muscle cell's twitch last longer than the cell's refractory period.

The additional oxygen that must be taken into the body after strenuous exercise in order to return the tissues to pre-exercise conditions is called the ____________________.

All smooth muscle is myogenic.

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 thick and thin filaments

Red muscle fibers contain myoglobin, but white muscle fibers do not.

The latch phenomenon in which myosin cross bridges hold onto thin myofilaments for a relatively long period is not a characteristic of skeletal muscle cells.