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a&p chap 7 prac quiz

QuestionAnswer
The muscle that can be described as multinucleated, striated and voluntary is skeletal muscle.
The muscle that can be described as involuntary, non-striated, and having a single nucleus is smooth muscle.
A sustained muscle contraction is referred to as tetanic contraction.
The functional unit of skeletal muscle is a sarcomere.
The plasma membrane, or phospholipid bilayer, of the skeletal muscle cell is referred to as the sarcoplasm.
The neurotransmitter active in skeletal muscle contraction is acetylcholine.
Muscle cells can store oxygen using the pigment myoglobulin
The site of attachment of a muscle that does not move during contraction is identified as the origin.
The broad sheet of fibrous connective tissue active in connecting one muscle to another is referred to as the aponeurosis.
A graded response occurs when multiple motor units are activated.
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
When breathing, the muscles that surround the thoracic cavity undergo ________ contractions. isotonic
You've just eaten something sour and pucker your lips in response. This occurs due to the contraction of the ________ muscle. orbicularis oculi
Which is the primary muscle used in smiling, when the corners of your moth lift upward? zygomaticus
To raise the mandible during chewing you would need to contract what two muscles? the masseter and temporalis
Contraction of the diaphragm results in inspiration
Which of the following muscles is the prime mover of the "hamstrings"? biceps femoris
Muscles that work together in a group such as the "hamstrings" are referred to as synergists.
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
Fibrosis of muscle tissue is caused by replacement of muscle tissue by fibrous connective tissue.
A skeletal muscle contains many fascicles of _________ bound together by _________ connective tissue. muscle fibers; fibrous
Contraction of myofibrils results from _________ cross-bridges pulling _______ filaments to the center of a sarcomere. myosin; actin
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
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
The accumulation of lactic acid during strenuous muscle activity results from a deficiency of oxygen.
An all-or-none response to a threshold stimulus is characteristic of individual muscle fibers.
A muscle's motor units are activated by different thresholds of stimulation, which enables a muscle to exhibit graded contractions.
When a muscle spanning a joint contracts, it pulls the ________ toward the ________. insertion; origin
Two muscles of mastication are the _________ and _________. masseter; temporalis
The superficial muscle that originates on the pubic bone and inserts on the tip of the sternum and costal cartilages is the rectus abdominis.
The muscle that abducts and extends the humerus is the deltoid.
The muscle that extends the forearm is the triceps brachii.
The muscle that extends and rotates the femur laterally is the gluteus maximus.
Select the three muscles that compose the hamstrings and flex the leg. biceps femoris, semimembranosus, semitendinosus
The ________ originates on the condyles of the femur, inserts on the calcaneus, flexes the leg, and plantar flexes the foot. gastrocnemius
Created by: 50611802
 

 



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