Exercise Physiology 1 Example Quiz (with Answers) 1f1h3u

EXERCISE PHYSIOLOGY 1 Name __________________________________ ______________________

EXAMPLE QUIZ Student ID

Section A Multiple choice (20 marks) On the answer sheet provided, circle the alternative which best answers the following questions. There is only one correct alternative for each question. Each question is worth 1 mark. You WILL NOT lose marks for incorrect answers in this section. 1. Glycogen is stored in which region of a muscle fiber?

*a. sarcoplasm b. sarcolemma c. sarcoplasmic reticulum d. T-tubules 2. Which protein does calcium bind to Ca2+ and thereby initiate muscle

contraction?

a. actin b. myosin *c. troponin d. tropomyosin 3. Type I muscle fibers

*a. have a high oxidative capacity b. store large quantities of glycogen c. generate force quickly d. fatigue quickly

4. Which type of contraction primarily occurs in the quadriceps (muscle on

front of thigh) as a person descends a flight of stairs? a. concentric b. isometric *c. eccentric d. asymmetrical

5. Why does a sarcomere that is too short or too stretched produce less

force?

a. Thick filaments get damaged. b. Thin filaments become unraveled. *c. Not as many cross-bridges can form. d. The reduction in force is negligible and can be ignored.

6. During the 400 m sprint (50-60 sec in duration), which two metabolic

pathways will be primarily involved in synthesising ATP for muscle contraction? a. ATP-PCr, oxidative phosphorylation b. glycolysis, β-oxidation *c. ATP-PCr, glycolysis d. β-oxidation, oxidative phosphorylation

7. The somatic nervous system most specifically belongs to which division of

the nervous system? a. peripheral b. autonomic c. sensory *d. motor

8. If a membrane potential changes from -70 mV to -65 mV, this is an

example of

*a. depolarization b. repolarization c. hyperpolarization d. threshold polarization

9. Action potentials travel fastest on axons that are

*a. myelinated and large b. unmyelinated and large c. myelinated and small d. unmyelinated and small

10. The sympathetic nervous system would contribute to

*a. increased heart rate b. skeletal muscle contraction c. skeletal muscle inhibition d. increased energy conservation

11. As Respiratory Exchange Ratio values approach 1.0,

a. the body is at rest b. physical exertion levels are moderate *c. glucose/glycogen metabolism is maximal or near maximal d. glycogen is depleted and metabolism is mostly of fat

12. How does heat build up in muscle contribute to fatigue?

*a. hastens glycogen depletion b. lowers muscle pH c. inhibits nerve impulse transmission to the muscle fiber d. inhibits gluconeogenesis

13. Which chamber of the heart has the thickest walls?

a. right atrium b. left atrium c. right ventricle *d. left ventricle

14. During exercise chemoreceptors stimulate an increase in breathing rate

and depth, the primary drive for this increase is because a. more oxygen is needed *b. excess CO2 needs to be “blown off” or exhaled c. blood pH was too alkaline d. PO2 was too high

15. Which of the following can be used to estimate maximum heart rate?

a. maximal cardiac output or maximal stroke volume b. 220 - age in years *c. 208 -(0.7 x age in years) d. the lactate threshold

16. Compared to untrained individuals, trained endurance athletes have

a. higher maximal heart rates b. higher resting cardiac outputs c. higher resting heart rates *d. higher maximal stroke volumes

17. During endurance exercise, total peripheral vascular resistance

a. increases greatly b. increases somewhat c. stays constant *d. decreases 18. During prolonged exercise at a fixed work load heart rate steadily

increases due to a phenomenon known as cardiovascular drift. This cardiovascular drift is primarily associated with a. increased muscle sympatholysis b. increased cardiac output *c. decreased venous return d. decreased afterload

19. Which athlete is the most powerful?

a. Athlete A (bench presses 100 kg over 0.5 m in 0.5 s) b. Athlete B (bench presses 200 kg over 0.5 m in 1.0 s) c. Athlete C (bench presses 300 kg over 0.5 m in 1.5 s) *d. They are all equally powerful

20. If the rate of oxidative production of ATP is low, then

*a. aerobic power is low b. aerobic power is high c. anaerobic power is low d. anaerobic power is high

Section B (10 marks) 1. Explain the differences between concentric, isometric and eccentric muscle contractions? (5 marks) Concentric contraction: Force is developed while the muscle is shortening Isometric contraction: Force is generated but the length of the muscle is unchanged Eccentric contraction: Force is generated while the muscle is lengthening

2.

There are a number of reasons as to why we might conduct a physiological test on an individual. List 5 of these reasons (5 marks) Any 5 of the following will do: Individual training prescription Detection of individual deficiencies, strengths and response rates Incentives/goals Education Analysis of energy demands Establish trends and patterns of distribution in population Health assessment

Section A Answer Key Student ID Given Name/s

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