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The alternating dark _______ and light________ give the muscle fiber its striated appearance
A band; I band
Name the two myofilaments that slide past one another to allow muscle cells to contract
Actin and myosin
During exercise, if there are sufficient oxygen molecules available in the muscle tissue
glucose is converted to pyruvic acid and then to water, carbon dioxide, heat, and ATP
What are contractions that maintain the same tension; contractions that shorten the length of the muscle; are the type most often used in a workout in the gym
Which of the following statements is FALSE concerning the neuromuscular junction
One sensory neuron may innervate many muscle fibers
If you work out in the gym and do some bicep curls, the contraction of the biceps would be considered
A tissue with striations and many flattened nuclei under the plasma membrane in each cell would be called
In a skeletal muscle fiber, the sarcomere is a repetitive unit that consists of the entire region between the
Smooth muscle fibers are characterized by
form the contractile tissue of the walls of many hollow organs.
What is the BEST definition of the origin of a muscle
the attachment of the muscle to a bone that is relatively fixed.
The nuclei of skeletal muscle cells are pushed aside by long ribbonlike organelles called _______, which nearly fill the cytoplasm
What is the specific neurotransmitter that is released by motor neurons and stimulates skeletal muscle
What specifically causes a muscle to contract
When the cocked heads of the myosin attach to the binding site the myosin heads pivot toward the center of the sarcomere.
When several muscles are contracting at the same time, the muscle that has the major responsibility for causing a particular movement is called the
Which of the following is a characteristic of skeletal muscle
Another name for skeletal muscle is voluntary muscle. Skeletal muscle cells are striated. Skeletal muscle tissue can contract rapidly and with great force, but tires easily and must rest after short periods of relativity.
Which of the following is a function of muscle
Generates heat; Produces movement;
Maintains posture; Stabilizes joints
Which of the following is a muscle of the head and neck
Temporalis; Zygomaticus; Buccinator Masseter
Which of the following is true of an action potential
It is initiated by a temporary permeability to sodium ions which rush into the cell.; An action potential is a wave of electrical current.; An action potential is an all or nothing phenomenon - once started it goes to completion.; The result of the action potential is the contraction of the muscle cell.
Which of the following refers to one neuron and all the skeletal muscle cells it stimulates
Which of the following statements is true
Tetanic contraction is normal and desirable and is quite different from the pathologic condition of tetanus.; When a muscle is stimulated so rapidly that no evidence of relaxation is seen and the contractions are completely smooth and sustained the muscle is said to be in tetanus or in tetanic contraction.; Tetanic contractions of muscles are smooth and prolonged muscle contractions which can be slight or vigorous depending on what work has to be done.; Complete tetanus is a smooth continuous contraction without any evidence of relaxation and results from a very rapid rate of stimulation.
Which of the following statements is true regarding energy generation for muscle contraction
One of the pathways for ATP regeneration is direct phosphorylation of ADP by creatine phosphate.; At rest and during light exercise, ATP is regenerated almost entirely by metabolic pathways that use oxygen.; Aerobic respiration refers to metabolic pathways that use oxygen.; The initial steps of glucose breakdown occur via a pathway called glycolysis, which does not use oxygen and is an anaerobic part of the metabolic pathway.
Which of the following statements is true regarding muscle attachments and body movements
The point of attachment of a muscle to the immovable or less movable bone is called the origin.; Flexion is a movement, generally in the sagittal plane, that decreases the angle of the joint and brings the two bones closer together.; Abduction is movement away from the body and occurs in the coronal plane.; In circumduction of the arm the distal end of the limb describes a cone.
maxilla and mandible near molars, orbicularis oris, compresses cheeck as in whistling and holds food between teeth during chewing
connective tissue covering of superior chest muscles, tissue around mouth, pulls corner of mouth inferiorly
sternum clavicle and first to sixth ribs, proximal humerus, adducts and flexes humerus
quadriceps group vasti
femur, tibial tuberosity via patellar ligament, all extends knee; rectus femoris also flexes hip on thigh
occipital bone and all cervical and thoracic vertebrae, scapular spine and clavicle, extends neck and adducts scapula
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