Exam 17: Muscle Contraction

The longer the initial length of a muscle, the stronger the contraction of that muscle can be.

A triad consists of a T-tubule sandwiched between sacs of the sarcoplasmic reticulum.

Explain the role of the skeletal muscles in heat production for the body.

Most body movements are _____ contractions.

Shivering in response to a drop in body temperature is an example of a positive-feedback mechanism in the body.

Susie Swift, an avid jogger, is running down the beach when she comes upon Bobby Beachbum, a serious weight lifter. Bobby flirts with Susie, who decides he has more muscle than brains. She continues her run down the beach, and Bobby begins to run after her. After about a half mile, Bobby tires and gives up. Explain why Susie was able to continue to run despite having less muscle mass than Bobby has.

List three conditions that influence the strength of muscle contraction.

Myocyte is another term for a muscle cell.

In the structure called a triad, the T-tubule is sandwiched between:

At rest, troponin covers the active sites on the actin molecules.

The thin myofilament is myosin, whereas the thick myofilament is actin.

Oxygen molecules in the sarcoplasm are bound to the troponin molecule.

Single-unit smooth muscle is another term for visceral muscle.

The characteristic of the muscle cell that directly causes movement is:

T-tubules are formed by an inward extension of the sarcolemma.

List three characteristics of muscles.

One I-band resides within two sarcomeres.

Myosin filaments attach to the Z disk.

List and describe the three general functions of skeletal muscle tissue.

Match each term with its corresponding definition or description. -Protein that joins with calcium ions to allow cross-bridges to form