Which of the following statements is false or incorrect?

Which of the following statements is false or incorrect? 

A) Cardiac muscle contracts when stimulated by its own autorhythmic muscle cells.
B) Under normal resting conditions, cardiac muscle tissue contracts and relaxes about 75 times per minute.
C) Cardiac muscle fibers depend mostly on anaerobic cellular respiration to generate ATP.
D) Cardiac muscle fibers can use lactic acid to make ATP.



Answer: C

What part of the sarcolemma contains acetylcholine receptors?

What part of the sarcolemma contains acetylcholine receptors? 

A) motor end plate
B) end of the muscle fiber
C) part adjacent to another muscle cell
D) any part of the sarcolemma




Answer: A

The part of the sarcolemma that contains acetylcholine receptors is the motor end plate.

Hypothetically, if a muscle were stretched to the point where thick and thin filaments no longer overlapped, ________.

Hypothetically, if a muscle were stretched to the point where thick and thin filaments no longer overlapped, ________. 

A) cross bridge attachment would be optimum because of all the free binding sites on actin
B) no muscle tension could be generated
C) maximum force production would result because the muscle has a maximum range of travel
D) ATP consumption would increase because the sarcomere is "trying" to contract



Answer: B

Of the following muscle types, which has only one nucleus, no sarcomeres, and rare gap junctions?

Of the following muscle types, which has only one nucleus, no sarcomeres, and rare gap junctions? 

A) visceral smooth muscle
B) multiunit smooth muscle
C) cardiac muscle
D) skeletal muscle



Answer: B

Three discrete types of muscle fibers are identified on the basis of their size, speed, and endurance. Which of the following athletic endeavors best represents the use of red fibers?

Three discrete types of muscle fibers are identified on the basis of their size, speed, and endurance. Which of the following athletic endeavors best represents the use of red fibers? 

A) a sprint by an Olympic runner
B) a long, relaxing swim
C) playing baseball or basketball
D) gym climbing




Answer: B

What is the most distinguishing characteristic of muscle tissue?

What is the most distinguishing characteristic of muscle tissue? 

A) the design of the fibers
B) the ability to respond to nervous stimulation
C) the diversity of activity of muscle tissue
D) the ability to transform chemical energy into mechanical energy


Answer: D