Exam 17: Muscle Contraction

The degree of a muscle's strength is influenced by many factors, including its metabolic condition and number of motor units recruited.

Which of the following is not associated with the thin myofilament?

Skeletal muscles produce a major share of the heat generated by the body.

Thick myofilaments extend the length of the:

T-tubules are unique to muscle cells.

The purpose of creatine phosphate in muscle contraction is to:

Myoglobin gives red muscle fibers their red color.

Match each term with its corresponding definition or description. -A neuron and all the muscle fibers it stimulates

The motor end plate is part of the neuromuscular junction.

The primary function of tropomyosin and troponin is to prevent a muscle from contracting.

Painful muscle contractions or involuntary twitches are called:

Muscles with less tone than normal are described as flaccid.

The pituitary gland is responsible for the homeostatic control of body temperature.

The following are characteristics that allow muscles to function as they do: excitability, contractility, extensibility, and regulation.

Myosin heads detach from the actin molecule when ATP attaches to it.

When troponin and calcium combine, it causes actin to shift and allows the myosin to form cross-bridges.

Match each term with its corresponding description regarding the sliding-filament theory. -Ion that is released by the sarcoplasmic reticulum

As resistance increases, the number of motor units needed to overcome that resistance has to increase.

Eccentric muscle contractions actually result in the lengthening of the muscle.

Skeletal muscle has a great ability to stretch.