a&p chap 7 prac quiz

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Question

Answer

The muscle that can be described as multinucleated, striated and voluntary is

skeletal muscle.

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The muscle that can be described as involuntary, non-striated, and having a single nucleus is

smooth muscle.

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A sustained muscle contraction is referred to as

tetanic contraction.

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The functional unit of skeletal muscle is

a sarcomere.

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The plasma membrane, or phospholipid bilayer, of the skeletal muscle cell is referred to as the

sarcoplasm.

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The neurotransmitter active in skeletal muscle contraction is

acetylcholine.

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Muscle cells can store oxygen using the pigment

myoglobulin

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The site of attachment of a muscle that does not move during contraction is identified as the

origin.

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The broad sheet of fibrous connective tissue active in connecting one muscle to another is referred to as the

aponeurosis.

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A graded response occurs when

multiple motor units are activated.

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A weight lifter is attempting a new level of weights that are too heavy for him. His muscles contract but can't shorten. This would be an example of what type of contraction?

isometric contraction

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When breathing, the muscles that surround the thoracic cavity undergo ________ contractions.

isotonic

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You've just eaten something sour and pucker your lips in response. This occurs due to the contraction of the ________ muscle.

orbicularis oculi

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Which is the primary muscle used in smiling, when the corners of your moth lift upward?

zygomaticus

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To raise the mandible during chewing you would need to contract what two muscles?

the masseter and temporalis

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Contraction of the diaphragm results in

inspiration

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Which of the following muscles is the prime mover of the "hamstrings"?

biceps femoris

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Muscles that work together in a group such as the "hamstrings" are referred to as

synergists.

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Cramps in a muscle can be caused by

a lack of ATP, a bulid-up of CO2 and lactic acid and a blow to the muscle

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Fibrosis of muscle tissue is caused by

replacement of muscle tissue by fibrous connective tissue.

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A skeletal muscle contains many fascicles of _________ bound together by _________ connective tissue.

muscle fibers; fibrous

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Contraction of myofibrils results from _________ cross-bridges pulling _______ filaments to the center of a sarcomere.

myosin; actin

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A motor neuron and the muscle fibers it controls constitute a __________, which contains _________ muscle fibers where precise muscle control is required.

motor unit; very few

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A muscle fiber is stimulated to contract when receptors on the _________ bind with acetylcholine released into the synaptic cleft by the axon tip of the ________.

sarcomere; motor neuron

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The accumulation of lactic acid during strenuous muscle activity results from a deficiency of

oxygen.

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An all-or-none response to a threshold stimulus is characteristic of

individual muscle fibers.

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A muscle's motor units are activated by different thresholds of stimulation, which enables a muscle to exhibit

graded contractions.

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When a muscle spanning a joint contracts, it pulls the ________ toward the ________.

insertion; origin

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Two muscles of mastication are the _________ and _________.

masseter; temporalis

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The superficial muscle that originates on the pubic bone and inserts on the tip of the sternum and costal cartilages is the

rectus abdominis.

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The muscle that abducts and extends the humerus is the

deltoid.

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The muscle that extends the forearm is the

triceps brachii.

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The muscle that extends and rotates the femur laterally is the

gluteus maximus.

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Select the three muscles that compose the hamstrings and flex the leg.

biceps femoris, semimembranosus, semitendinosus

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The ________ originates on the condyles of the femur, inserts on the calcaneus, flexes the leg, and plantar flexes the foot.

gastrocnemius

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