Muscle tone keeps muscles healthy. What is muscle tone, and what causes it? What happens to a muscle that loses its tone?

Which of the following statements about myofibrils is not correct? (a) Each skeletal muscle fiber contains hundreds to thousands of myofibrils. (b) Myofibrils contain repeating units called sarcomeres. (c) Myofibrils extend the length of a skeletal muscle fiber. (d) Filaments consist of bundles of myofibrils. (e) Myofibrils are attached to the plasma membrane at both ends of a muscle fiber.

An action potential can travel quickly from one cardiac muscle cell to another because of the presence of (a) gap junctions, (b) tight junctions, (c) intercalated discs, (d) both a and c.

What three layers of connective tissue are part of each muscle? What functional role does each layer play?

How does cardiac muscle tissue contract without neural stimulation?

Identify the structures in the following figure. a. ___b. ___c. ___d. ___e. ___f. ___g. ___h. ___

Bill broke his leg in a football game, and after six weeks the cast is finally removed. As he steps down from the examination table, he loses his balance and falls. Why?

Multiple ChoiceMore than one choice may apply.Your ability to lift that heavy couch would be increased by which type of exercise?a. Aerobicb. Endurancec. Resistanced. Swimming

The smooth muscle type found in the walls of digestive and urinary system organs and that exhibits gap junctions and pacemaker cells isa. multi unit,b. unitary.