Exam 12: Muscles

Compare and contrast the structural and functional differences between single-unit and multi-unit smooth muscle fibers, particularly in regard to their ability to vary their force of contraction.

Calcium, released by the sarcoplasmic reticulum, binds to ________ to move the ________, which allows actin to form of a ________ with myosin.

During heavy exercise, the ATP requirements of active muscle are likely to be met by metabolism of

An important difference between single-unit and multiunit smooth muscle is the

Put these myofibers in the order they would be recruited as the body moves from a weak to a strong stimulus: 1)glycolytic fast-twitch fibers 2)fatigue-resistant oxidative fast-twitch fibers 3)fatigue-resistant slow-twitch fibers

Muscle fatigue arises primarily from failure in

The nervous system avoids muscle fatigue during submaximal contraction by

Skeletal muscle cells are usually attached to bone by

List, compare, and contrast the types of skeletal muscle fibers based on their speed of contraction and resistance to fatigue.Give examples of where each type might be found, and why it is advantageous for each type to occur there.

Compared to skeletal muscle, contraction of smooth muscle cells is

A certain drug is known to block monovalent cation channels.This drug is used as a "muscle relaxer." Would it affect both smooth and skeletal muscles or only skeletal muscles? Defend your answer.

List and explain the functions of the regulatory molecules in a sarcomere, specifying how the on and off positions are controlled and its impact on the crossbridges formed.

Store-operated calcium channels open in response to ________.

A motor unit consists of

Which of the following is NOT a correct comparison of cardiac myocytes to other muscle cell types?

The cause of skeletal muscle fatigue during extended submaximal exercise is primarily a(n)

The thick filament of the myofibril is composed of ________ molecules whereas ________ is a protein that makes up the thin filaments.

Fatigue that occurs in response to extended submaximal exertion is usually due to ________ whereas fatigue to a short duration of maximal exertion involves ________.

Match from the following list. -The structures that serve as the attachment site for the thin filaments and mark the boundaries for one sarcomere.

Match from the following list. -The letter assigned to this structure stands for the German word for middle; it is the attachment site for the thick filaments.