Chapter 9 True/ False
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
