Week Four Quiz
Chapter 9 Muscular System: Histology and Physiology________________________________________
b. maintenance of posture
d. constriction of organs
e. production of heat
b. Smooth muscle is found in the walls of hollow organs.
c. Cardiac muscle cells have multiple nuclei.
d. Smooth muscle cells are long and cylindrical.
e. There is a small amount of smooth muscle in the heart.
b. smooth muscle
c. cardiac muscle
d. both skeletal and cardiac muscle
e. both cardiac and smooth muscle
b. size of muscle fibers.
c. number of striations.
d. number of nuclei within the muscle fibers.
e. number of muscle cells.
b. contain both myosin and tropomyosin.
c. are held in place by the M line.
d. contain strands of fibrous actin.
e. are the thickest proteins in muscle.
b. acetylcholine moves into the presynaptic terminal.
c. a local potential is generated in the presynaptic terminal.
d. ligand-gated ion channels in the presynaptic terminal are opened.
e. nothing else happens.
b. myosin heads bind to exposed active sites on actin.
c. cross-bridges form between myosin heads and calcium ions.
d. movement of the troponin-tropomyosin complex causes actin myofilaments to slide.
e. ATP binds to actin myofilaments.
b. increased concentration of calcium ions around the myofibrils
c. exposure of more active sites on myosin myofilaments
d. the breakdown of elastic elements in the cell
e. decreased stimulus frequency
b. a muscle produces constant tension during contraction.
c. a muscle produces an increasing tension during contraction.
d. a muscle produces increasing tension as it shortens.
e. a muscle produces tension, but the length of the muscle is increasing.
b. aerobic respiration
c. both anaerobic and aerobic respiration
Chapter 10 Muscular System: Gross Anatomy________________________________________
b. hyperextension of the head
c. standing on your tiptoes
d. flexion of the elbow to elevate the hand
e. lifting weight with your arm
e. All of these choices are correct.
b. serratus anterior
c. pectoralis minor
e. rhomboideus major
b. biceps brachii
c. triceps brachii
b. accounts for a sprinter’s stance.
c. allows one to sit cross-legged.
d. is used in the knee-jerk reflex.
e. is a common site for injections.
b. serratus anterior
c. rectus abdominis
d. external oblique
e. internal oblique
c. pectoralis major
d. biceps brachii
e. serratus anterior
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