quiz 5 ch 9

Created by emmasma 

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A reserve of high energy phosphate is stored in muscle as

Phosphocreatine

A shortening of the muscle that occurs when the tension is greater than the load is a(n)

Concentric contraction

ATP is required to release a myosin head from a thin filament.

True

Ca2+ must bind to tropomyosin so that the myosin binding sites on actin will be accessible to the myosin.

False

cardiac muscle contains Intercalated discs contain gap junctions

True

Central fatigue is caused by

Changes in the CNS

Cross bridge formation occurs when myosin heads attach to actin molecules located on the thin filaments.

True

During skeletal muscle contraction,

Thin filaments slide across thick filaments

During the cross bridge cycle,

ADP is released at the end of the power stroke

Each cell of a multiunit smooth muscle must by stimulated to contract independently.

True

Endurance training increases the oxidative capacity of a muscle cell.

True

Fatigue appears to occur due to the reduced ability of the sarcoplasmic reticulum release of Ca2+ with neural stimulation.

True

Fatigue appears to occur due to the reduced ability of the sarcoplasmic reticulum release of Ca2+ with neural stimulation.

True

High intensity exercise can increase muscle size by promoting an increase in muscle fiber size.

True

High-energy phosphates are stored in skeletal muscle as glycogen.

False

In regards to the relationship between resting muscle fiber length and tension generated,

Maximal tension is generated when the thick and thin filaments slightly overlap

Motor unit recruitment allows for _________ contraction strength.

Increased

Muscle fatigue Occurs when muscles are only partially able to contract

False

Oxygen dept occurs during exercise because

lactic acid metabolism requires oxygen;
oxygen has been removed from muscle fibers;
oxygen has been removed from the blood.;
All of these choices are correct.

Relaxation of a muscle fiber following contraction is a passive process and uses no ATP.

False

Repaying the oxygen debt requires replacing oxygen that was

Bound to blood hemoglobin;
Bound to muscle myoglobin;
Used for tissue warmup;
All of these choices are correct

Sarcomeres contain actin, myosin, troponin and tropomyosin.

True

Smooth muscle cells May contain gap junctions

True

The Ca2+ required for skeletal muscle contraction

Is released from the sarcoplasmic reticulum

The first 1 to 2 minutes of moderate to heavy exercise relies on _____ for ATP production.

Anaerobic respiration of glucose

The main function of a transverse tubule is to allow the conduction of an action potential deep into a muscle fiber.

True

The movement of the troponin-tropomyosin complex requires

Ca2+

The thick filaments in a muscle correspond to the _____.

A bands

Thin filaments in skeletal muscle fibers contain _____.

A, C, and D are all correct.

This is true under heavy exercise in the first 30 minutes of activity:

Not all correct

What type of muscle contraction occurs when a muscle lengthens during contraction?

Isotonic;
Eccentric;
Both B and D are correct.

When a muscle cell generates tension but does not shorten, a(n) ______ contraction occurs.

Isometric

Which of the following is a characteristic of fast twitch muscle fibers?

fewer mitochondria;
white fibers;
less myoglobin
thicker

Which of the following is true about the series-elastic component to contraction?

It absorbs some of the tension of muscle contraction;
It provides elastic recoil when muscles relax;
It is provided by tendons

With the series-elastic component It must loosen for a muscle to shorten

False

Skeletal muscles at rest obtain most of their energy from the aerobic respiration of

Fatty acids

Transverse tubules contain voltage-gated calcium channels that respond to membrane depolarization and are directly coupled to the calcium release channels in the sarcoplasmic reticulum.

True

Which component of a muscle fiber does not change in length during a concentric contraction?

A band

ATP in muscle contraction is needed for

Attachment of myosin cross bridges to actin;
Release of myosin cross bridges from actin;
Pumping of Ca2+ back into the sarcoplasmic reticulum;
All of these choices are correct

The inability of muscle cells to relax due to high-frequency stimulation is termed

Complete tetanus

Which of the following is true about the series-elastic component to contraction?

It is provided by tendons;
It provides for elastic recoil when muscles relax;
It absorbs some of the tension of muscle contraction

Fast twitch fibers have the greatest

`resistance to fatigue.
False

ATP is required to release a myosin head from a thin filament.

True

Thin filaments are composed of myosin and tropomyosin.

False

Increasing the frequency of action potentials in a somatic motor neuron will induce increased force of muscle contraction.

True

What type of muscle contraction occurs when a muscle lengthens during contraction?

Eccentric;
isotonic;
Both B and D are correct.

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