16 Jun University of Phoenix NSCI 280 Week 4 Quiz
Question
University of Phoenix Material
Week Four Quiz
Chapter 9 Muscular System: Histology and Physiology________________________________________1. Which of the following is NOT a function of skeletal muscle?
a. body movementb. maintenance of posturec. respirationd. constriction of organse. production of heat
2. Which of the following is true?
a. Skeletal muscle is capable of spontaneous contraction.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.
3. Which type of muscle tissue has cells that branch?
a. skeletal muscleb. smooth musclec. cardiac muscled. both skeletal and cardiac musclee. both cardiac and smooth muscle
4. Hypertrophy of skeletal muscles from weight lifting is caused by an increase in the
a. number of muscle fibers.b. size of muscle fibers.c. number of striations.d. number of nuclei within the muscle fibers.e. number of muscle cells.
5. Actin myofilaments
a. resemble bundles of minute golf clubs.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.
6. When an action potential reaches the presynaptic terminal,
a. calcium ions diffuse into the presynaptic terminal through voltage-gated ion channels.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.
7. In excitation-contraction coupling,
a. calcium ions must bind with myosin to expose active sites on actin.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.
8. Which of the following helps explain the increased tension seen in multiple wave summation?
a. increased motor unit recruitmentb. increased concentration of calcium ions around the myofibrilsc. exposure of more active sites on myosin myofilamentsd. the breakdown of elastic elements in the celle. decreased stimulus frequency
9. An isotonic contraction is described as
a. action potential frequency is high enough that no relaxation of muscle fibers occurs.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.
10. Which type of respiration occurs in the mitochondria?
a. anaerobic respirationb. aerobic respirationc. both anaerobic and aerobic respiration
Chapter 10 Muscular System: Gross Anatomy________________________________________1. The sternocleidomastoid muscle extends from the mastoid process of the temporal bone to the sternum and medial clavicle. When both sternocleidomastoid muscles contract, the head is flexed. The end of the muscle that connects to the sternum is the
a. origin.b. belly.c. body.d. insertion.e. fixator.2. Which of the following represents a class I lever system?
a. crossing your legsb. hyperextension of the headc. standing on your tiptoesd. flexion of the elbow to elevate the hande. lifting weight with your arm3. In order to stabilize the hyoid so that the larynx can be elevated in swallowing, the _____ muscle group is used.
a. Pterygoidb. Infrahyoidc. Auricularisd. Suprahyoide. hyoglossus4. If abdominal muscles are contracted while the vertebral column is fixed this will aid in
a. vomiting.b. childbirth.c. urination.d. defecation.e. All of these choices are correct.5. Which muscle will depress the scapula or elevate the ribs?
a. levator scapulaeb. serratus anteriorc. pectoralis minord. subclaviuse. rhomboideus major
6. Which of the following muscles extends the forearm and has its insertion on the ulna?
a. Deltoidb. biceps brachiic. triceps brachiid. brachialise. coracobrachialis7. The gluteus maximus
a. does most of the work in “sit-ups.”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.
8. Label muscle “A” on the diagram.
a. orbicularis oculib. temporalisc. trapeziusd. sternocleidomastoide. masseter
9. Label muscle “A” on the diagram.
a. linea albab. serratus anteriorc. rectus abdominisd. external obliquee. internal oblique
10. What does “A” represent?
a. Coracobrachialisb. Deltoidc. pectoralis majord. biceps brachiie. serratus anterior
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