Exam 9: Muscular System

A gluteal gait, in which a person walks with a waddling limp, is usually caused by a disorder of the

Acetylcholine released by the myofibril crosses the synaptic cleft to bind to the motor neuron ending.

Muscle atrophy that progresses with aging is caused by reduction in 

Since many muscles are named for their location (origin and insertion), the zygomaticus muscles probably originate on the ________ bone of the skull. 

Which of the following is unique in that its insertion is to fascia and not bone?

The striated appearance of skeletal muscle fibers results from the

The characteristic reddish brown color of skeletal muscle comes from which substance?

What enzyme degrades acetylcholine, keeping it from accumulating in the synapse?

The increase in the number of motor units activated as a result of more intense stimulation is called

People with myasthenia gravis have a deficiency of

Smooth muscle has ________ and not troponin.

Since many muscles are named for their location (origin and insertion), the occipitalis muscle probably originates on the ________ bone of the skull.

Fibers of muscles whose motor neurons are severed

Muscle fibers are basically a collection of

The muscle that causes an action is the

In a recording of a muscle twitch, the delay between the time a stimulus is applied and the time the muscle responds is called the

The linea alba is

Bones and muscles function as mechanical devices called

In the initiation of muscle fiber contraction, calcium ions bind to tropomyosin, exposing active sites on actin for cross-bridge formation.

The outermost layer of connective tissue surrounding a skeletal muscle is the