Exam 17: Muscle Contraction

The strength of a muscle contraction is influenced by the:

In muscles, oxygen can be transferred to the calcium by myoglobin molecules.

Slow fibers are also called white fibers, because they contain a low concentration of myoglobin.

In the "warmed up" muscle, the calcium ions are able to be completely returned to the sarcoplasmic reticulum.

Muscle cells produce heat by the process of catabolism.

The graded strength principle states that:

Which of the following is not a factor in why a warm muscle contracts more forcefully than a cool muscle?

The sarcoplasmic reticulum in muscle cells is identical to the rough endoplasmic reticulum in other cells.

ATP is made up of adenine, ribose sugar, and three phosphate groups.

Skeletal muscle organs contract on the all-or-none principle.

The lactate produced by anaerobic respiration is converted back to glucose in the:

Skeletal muscles are innervated by:

Explain the similarities and differences between skeletal and cardiac muscle cells. How do these differences reflect the functioning of the heart?

Match each term with its corresponding definition or description. -The ability of a muscle cell to shorten

Explain what is meant by the graded strength principle of muscle contraction.

A motor neuron is considered part of the neuromuscular junction.

In psychological muscle fatigue, an individual cannot contract his or her muscles.

A compound that mimics the action of acetylcholine at the neuromuscular junction would cause muscles to become flaccid.

Match each term with its corresponding definition or description. -A segment of the myofilament between two Z-lines

Muscles usually contract to about _____ of their length.