Chapter 9 True/ False

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It is easier to fatigue an arm muscle than the heart muscle.

True

Recruitment is the process in which there is an increase in the number of motor units activated.

True

Skeletal muscles continue to contract following death.

True

Smooth muscle can be stimulated to contract by stretching.

True

Tenosynovitis is an inflammation of the connective tissue associated with muscles.

True

The abdominal muscles commonly insert on the linea alba.

True

The biceps brachii is located on the humerus but has no major attachments to the humerus.

True

The heart muscle will still contract even if removed from the body.

True

The liver can convert lactic acid to glucose.

True

The motor end plate is the specialized thickened membrane of the muscle fiber.

True

The orbicularis muscles are sphincter muscles, which cause the eyes to squint and lips compress

True

The part of the muscle that moves is referred to as its insertion.

True

The staircase effect refers to an increase in the strength of a muscle contraction that occurs during exercise.

True

The triceps brachii is an antagonist of the brachioradialis.

True

The tropomyosin-troponin complexes block the active sites on the actin preventing the contraction.

True

There are skeletal muscles attached to the penis or clitoris.

True

Torticollis is a condition in which the neck muscles contract involuntarily.

True

Treatment for compartment syndrome may involve a fasciotomy.

True

A nerve fiber comes in direct contact with a muscle fiber at the neuromuscular junction.

False

Cardiac muscle is striated, found only in the heart, and does not rely on calcium as much as skeletal muscles do for contraction.

False

Energy is normally not consumed during the relaxation process.

False

In general, the flexors of the hand and fingers are located on the posterior surface of the forearm.

False

Isotonic contractions occur as one pushes against the wall of a building.

False

Red muscles are slow contracting and are typically found in the eyelids and hands.

False

Smooth muscle fibers usually can respond faster than skeletal.

False

Smooth muscles are not striated and as such do not have actin and myosin filaments.

False

The enzyme acetylcholinesterase acts to increase the force of a muscle contraction.

False

The expression "oxygen debt" refers to the lack of sufficient oxygen and lactic acid for contraction.

False

The heart only contains cardiac muscle.

False

The inability to contract, or fatigue, is primarily caused by a lack of glucose and oxygen in muscle.

False

The myofilaments are comprised of myofibril units.

False

The temporalis is attached to the temporal bone and plays its greatest role in facial expression.

False

The term muscle fiber is synonymous with a group of muscle cells.

False

The triceps has one head of origin on the humerus and two on the scapula.

False

Troponin is a muscle protein whose chemical activity causes contraction of muscle fibers.

False

When one is standing upright, the gluteus muscles are mainly in a state of relaxation.

False

A muscle causing flexion is the antagonist to one that could cause extension at the same time.

True

A skeletal muscle also contains smooth muscle fibers within it.

True

Acetylcholine causes the release of calcium from the sarcoplasmic reticulum.

True

Food poisoning from botulism can cause death from respiratory failure.

True


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