Exam 8: Muscular System

Where are the vesicles that contain neurotransmitter molecules located?

Recruitment refers to increasing the number of motor units involved in a muscle contraction.

Where would an antagonist to the sternocleidomastoidmuscles be located?

The connective tissue covering that separates a muscle into fascicles is called the __________.

Consider the components of the lever that causes the flexion of the upper limb at the elbow. The fulcrum of the lever is the __________ and the force to move the rigid bar (the forearm bones) is provided by contraction of the __________.

Compared to skeletal muscle, smooth muscle contracts __________ and relaxes __________.

Small, sustained contractions that are the result of repeated nervous stimulation, originating from the spinal cord and stimulating only a few muscle fibers at a time, is called __________.

What structures consist of actin and myosin filaments?

Curare is a poison that binds to acetycholine receptors at the motor end plate. What is the result of curare poisoning?

What type of muscle cell has a sarcoplasmic reticulum that is not well developed?

The characteristic reddish color of skeletal muscle is due to the presence of what substance?

Acetylcholine released by a motor neuron crosses the synaptic cleft and reaches the motor end plate by diffusion.

The connective tissue covering that separates a muscle into fascicles is called the __________.

What is an alternate name for a skeletal muscle cell?

The __________ is the gap that separates a muscle cell membrane from the neuron cell membrane in a neuromuscular junction.

During the motion that extends the upper limb at the elbow, the elbow joint represents which part of the lever?

What results when a muscle fiber is stimulated repeatedly at a fast enough pace that, though it starts to relax between stimuli, it cannot completely relax between contractions?

The muscle most responsible for a particular movement is called the prime mover or antagonist.

What is the main component of thin filaments?

In skeletal muscle, the thick filaments are mainly composed of ___________.