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Extensibility refers to the ability of a muscle to stretch.


A dark band formed by parallel thick filaments that partly overlap the thin filaments is known as an H band


The sarcoplasmic reticulum is the smooth ER of a muscle fiber.


Clinically, dystrophin is the most important noncontractile protein to occur in muscle fibers


The sliding filament theory of muscle contraction has emerged from research only in the last 10 to 15 years.


A deficiency of Ach receptors leads to muscle paralysis in myasthenia gravis


An isometric contraction does not change muscle length


Some smooth muscle is autorhythmic.

Smooth muscle

Which one is most dependent on extracellular Ca2+?

Skeletal muscle

Which muscle tissue contracts in response to conscious nervous stimulation?

Smooth muscle

Which does not exhibit striations

Cardiac muscle

Which has the widest T tubules?

Smooth muscle

Which muscle tissue has the greatest capacity for regeneration?


Which acts during a power stroke?


Which is predominately made up of myosin?


Which band contains overlapping thick and thin filaments?

to neutralize carbon dioxide buildup

Which of the following is not a purpose of the excess postexercise oxygen consumption in muscle?

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?

in the liver

Where is lactic acid converted to pyruvic acid?

5 ATP per second

During muscle contraction, a single myosin head consumes ATP at a rate of about

isotonic contraction

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

type IIB fast glycolytic fibers

Which fibers are primarily responsible for producing lactic acid?

intermediate fibers.

Michael Jordan was arguably the best player in professional basketball history. Scientifically one would expect him to have highly developed

intercalated discs of cardiac muscle

Where would you expect to find numerous gap junctions in muscular tissue?

it does not have Z discs

The contraction strength of smooth muscle is relatively independent of its resting length partly because

contracts more rapidly but relaxes more slowly.

In comparison to skeletal muscle, smooth muscle


Which of the following is very important for muscle to continue contraction during anaerobic respiration?

the threshold.

The minimum stimulus needed to cause muscle contraction is called

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

The muscle lengthens but tension remains constant.

Which of the following is true concerning isotonic eccentric contraction?

cardiac muscle

Which of the following has the largest mitochondria?


One somatic motor neuron is stimulated by how many muscle fibers?

synaptic knob

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


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

to inhibit the function of cholinesterase

Which statement best describes the goal of medications used to treat myasthenia gravis?


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


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

satellite cells.

Cardiac muscle has very little capacity for regeneration because it lacks

goose bumps

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

two terminal cisternae and one T tubule.

The triads of a muscle fiber consist of

recruit more muscle fibers.

As you are lifting a box someone places extra weight on top of it. For your muscle to continue contracting and lifting the box, the muscle must


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

prevent calcium from entering smooth muscle, thus allowing the muscle to relax

Drugs called calcium channel blockers may be used to lower blood pressure by causing arteries to vasodilate. These drugs

no effect

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

between the thin myofilaments and the sarcolemma of a muscle fiber.

Dystrophin, the protein that is defective in muscular dystrophy, is normally found

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

A reason that muscle twitches become progressively stronger in treppe is

to release norepinephrine.

The purpose of varicosities in muscle physiology is

donates one of its phosphate groups to ADP.

Creatine kinase

increases permeability of the sarcolemma.

Release of ACh

The intracellular environment is negatively charged.

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


The sarcolemma of a resting muscle fiber is most permeable to

. The triad allows for Ca2+ release when a muscle fiber is excited.

What is the purpose of the triad?

a 22-year-old football player

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

the phosphagen system

Which of the following systems would provide energy for a racquetball player?


Loss of muscle mass from lack of activity is termed


Which of the following is not a characteristic of a muscle cell?


Collagen is

an elastic filament.

A myofilament that flanks a thick filament and anchors it to a Z disc is called


The bladder's ability to greatly distend and return to normal tension is due to the ___ of smooth muscles

partially stretched before being stimulated

A skeletal muscle generates the greatest tension when it is

make more use of aerobic respiration.

A volleyball player depends on the gastrocnemius muscles for plantar flexion, whereas a marathon runner depends more on the soleus muscles for the same action. This is because the soleus muscles


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


In skeletal muscle, alternating light and dark bands are termed

increase the average number of myofibrils per muscle fiber.

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

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