Chapter 4 Flashcards
Which of the following is NOT one of the functions of muscle?
Conduct nerve impulses to the brain
A bundle of muscle fibers is know as which of the following?
Fascicle
The connective tissue that surrounds an individual fiber is the:
Endomysium
The connective tissue that surrounds a fascicle is known as the:
Perimysium
Which of the following is an example of a circular muscle?
Orbicularis oris
The muscle that is the prime mover or main muscle producing a particular movement is known as which of the following:
Agonist
A muscle contraction in which the muscle length stays the same is known as which of the following?
Isometric
Muscle tone is maintained by the stimulation of _____ scattered within the muscle.
Muscle spindles
Which muscle originated along the temple, inserts on the coronoid process and ramus of the mandible, and elevates and retracts the mandible?
Temporalis
Which large, anterior neck muscle originates on the superior margin of the sternum and medial aspect of the clavicle, inserts on the mastoid process of the temporal bone, and can flex the neck or rotate the head to the opposite side.
Sternocleidomastoid
Which muscle elevated the scapula?
Levator scapula
Which muscle or muscle group extends the trunk?
Erector spinae
Which muscle is the primary muscle of breathing?
Diaphragm
The large, superficial muscle of the back that elevates, depresses, adducts and rotates the scapula is which of the following?
Trapezius
The large chest muscle that originates on the sternum, ribs, and clavicle, inserts on the humerus, and flexes, adducts, and medially rotates the humerus is which of the following?
Pectoralis major
Each muscle cell is know as a:
Muscle fiber
A whole muscle is surrounded by muscle tissue known as:
Epimysium
_____ are a collection of specialized proteins that form a myofibril.
Myofiliments
The region where the nerve and muscle communicate is the:
Neuromuscular junction
The _____ explains the process of muscle contraction at the molecular level.
Sliding filament theory
In terms of muscle fiber organization, the pectoralis muscle in the chest is an example of a _____ muscle.
Triangular
A ____ is a sensory nerve ending wrapped around the collagen fibers of tendons that monitors muscle tension.
Golgi tendon organ
____ muscle is present in the walls of the heart and is used to propel blood from the chambers.
Cardiac
The four quadriceps muscles include ______, vastus lateralis, vastus medialis, and vastus intermedius.
Rectus femoris
The three ______ muscles include biceps femoris, semimembranosus, and semitendinosus.
Hamstring
True or False? Actin is known as the thick filament.
False
True or False? The small gap between the synaptic knob and the sarcolemma of a muscle fiber is known as the synaptic cleft.
True
True or False? Smooth muscle is spindle-shaped, with no striations.
True
True or False? The popliteus attaches to the proximal shaft of the tibia.
True
True or False? The gastrocnemius is located in the forearm.
False
True or False? Extensor hallucis longus extends the big toe.
True
True or False? The dorsal interossei are located on the bottom of the foot.
False
True or False? Longissimus thoracis extends the spine.
True
True or False? The deltoid inserts on the humerus and flexes and medially rotates the shoulder joint.
True
True or False? The masseter is used for chewing.
True
