Exam 43: Muscles, Bones, and Body Movements

Skeletal muscle contractions can be adjusted from gentle to strong because ____ are controlled by the axon branches of a single efferent neuron.

The region between two adjacent "Z lines" is known as a ____.

A muscle that causes any type of movement in a joint when it contracts is called a(n) ____.

The ribs and sternum are considered to be part of ____.

Describe the molecular activity that leads to muscle contractions, beginning at the neuromuscular junction.

Skeletal muscles attach to bones by ____.

The binding of ____to ____ directly triggers the power stroke in skeletal muscle contraction.

Human vertebrae are held together by ____ joints.

The I bands in skeletal muscle are composed of ____.

A muscle that increases the angle between two bones at a joint is called a(n) ____.

Figure 43.3 -Answer the question using the accompanying figure. The structure labeled "C" is a modified form of the ____.

Duchenne muscular dystrophy is caused by a mutation that ____.

An animal that is evolved for rapid movement over the ground will have relatively ____ bones.

Muscles that act as opposing pairs are____.

The patterns by which muscles connect to bones are the same  in all vertebrates.

The ____ joints are usually highly moveable, with a fluid-filled capsule of connective tissue surrounding them.

Skeletal muscles in vertebrates connect to ____.

Unlike endurance training, weight lifting will convert ____.

In skeletal muscle contraction, the neurotransmitter ____ is released at the axon terminal of the neuromuscular junction to trigger an action potential in the muscle cell.

Compare and contrast a single, weak contraction of a muscle fiber, a twitch summation, and tetanus.