Chapter 11 Muscular Tissue

Ca2+ accumulates in the sarcoplasm faster than the sarcoplasmic reticulum can reabsorb it.

A reason that muscle twitches become progressively stronger in treppe is

recruitment

A single high-voltage stimulation of a muscle will result in

partially stretched before being stimulated

A skeletal muscle generates the greatest tension when it is

36

Aerobic respiration produces approximately _____ more ATPs per glucose molecule than glycolysis does

longer aerobic respiration

Athletes who train at high altitudes increase their red blood cell count and thus increase their oxygen supply during exercise. Increased oxygen supply results in

no effect

Exposure to Clostridium tetani causes continuous release of ACh. What effect does this have on smooth muscle?

incomplete tetanus.

If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be

tropomyosin

In a relaxed muscle fiber, the active sites of actin are blocked by

contracts more rapidly but relaxes more slowly.

In comparison to skeletal muscle, smooth muscle

striations

In skeletal muscle, alternating light and dark bands are termed

atrophy

Loss of muscle mass from lack of activity is termed

increases permeability of the sarcolemma.

Release of ACh

tetanus

The absence or inhibition of AChE at a synapse would lead to which of the following?

the threshold.

The minimum stimulus needed to cause muscle contraction is called

troponin

The protein that acts as a calcium receptor in skeletal muscle is

isotonic contraction

The term for shortening of a muscle while maintaining constant tension is

increase the average number of myofibrils per muscle fiber.

The training regimen of a competitive weight lifter is designed partly to

synaptic knob

To stimulate muscle contraction, acetylcholine is released from the ___________ into the

Smooth muscle

Which does not exhibit striations

skeletal muscle

Which muscle type depends solely on the sarcoplasmic reticulum as its calcium source?

smooth and cardiac muscle

Which muscle(s) can contract without the need for nervous stimulation?

The intracellular environment is negatively charged.

Which of the following best describes the resting membrane potential (RMP)?

cardiac muscle

Which of the following has the largest mitochondria?

a 22-year-old football player

Which of the following individuals would have more mitochondria in his skeletal muscle?

The muscle lengthens but tension remains constant.

Which of the following is true concerning isotonic eccentric contraction?

goose bumps

Which of the following would be caused by contraction of smooth muscle?

Smooth muscle

Which one is most dependent on extracellular Ca2+?