Ex Phys Practice Tests

Front 1

Ca2+ iocs (essential for contraction) are stored in the ____________.

Back 1

Sarcoplasmic Reticulum

Front 2

Which protein is sensitive to Ca2+ and thereby helps initiate contraction?

Back 2

Troponin

Front 3

Which protein shields the myosin-binding site, preventing contraction from happening at rest?

Back 3

Tropomyosin

Front 4

The process of plasmalemma depolarization involves with ion?

Back 4

Na+

Front 5

Why is it necessary to have an action potential (electrical signal) in the muscle for contraction?

Back 5

The SR will only release Ca2+ if it has been electrically stimulated.

Front 6

T/F: The amount of force generated in a single-muscle finer is related to the number of myosin cross-bridges and making contact with actin.

Back 6

True

Front 7

T/F: It is only when the muscle is shortened to >60% of its resting length, that you have the development of greater muscle tension.

Back 7

False

Front 8

T/F: Muscular contractions that occur during normal body movements are titanic contractions.

Back 8

True

Front 9

T/F: For a titanic contration to occur, neural impulses to various motor units must arrive at the same time.

Back 9

False

Front 10

T/F: At any absolute force exerted by the muscle, the velocity or speed of movement is greater in muscles that contain a higher percentage of slow fibres when compared to muscles that possess predominantly fast fibres.

Back 10

False

Front 11

T/F: The maximum velocity of muscle shortening is greatest at the lowest force (i.e. resistance against the muscle).

Back 11

True

Front 12

T/F: Fiber type distribution of muscle is not a factor that influences the power-velocity curve.

Back 12

False

Front 13

T/F:Metabolism is regulated by enzymatic activity. An enzyme that regulates a metabolic pathway is termed the rate-limiting enzyme.

Back 13

True

Front 14

T/F: The body uses carbohydrates, fat, and protein nutrients consumed daily to provide the necessary energy to maintain cellular activities both at rest and during.During exercise the primary nutrients used for energy are protein and carbohydrates, with fat contributing a relatively small amount of the total energy used.

Back 14

False

Front 15

T/F: The simplest and consequently, the most rapid method for producing ATP involves the donation of a phosphate group and its bond energy from PC to ADP to form ATP.

Back 15

True

Front 16

T/F: The fact that depletion of PC is likely to limit short-term, high-intensity exercise has led to the suggestion that ingesting large amounts of creatine can improve exercise performance.

Back 16

True

Front 17

T/F: The ATP-PC system and glycolysis are two anaerobic metabolic pathways that are capable of producing ATP with O2.

Back 17

False

Front 18

T/F: For every molecule of glucose entering glycolysis, 2 molecules of pyruvate are formed, and in the presence of O2, they are converted to 4 molecules of acetyl-CoA.

Back 18

False

Front 19

T/F: The primary function of the Krebs Cycle is to remove hydrogens and the energy associated with those hydrogens from various substrates involved in the cycle.

Back 19

True

Front 20

T/F: The aerobic production of ATP (called oxidative phosphorylation) occurs in the mitochondria. The pathway responsible for this process is called the electron transport chain.

Back 20

True

Front 21

T/F: Aerobic production of ATP is possible due to a mechanism that uses the potential energy available in reduced hydrogen carriers such as NADH and FADH to rephosphorylate ADP to ATP.

Back 21

True

Front 22

T/F: Fat provides less kilocalories of energy per gram than carbohydrate but require less oxygen than carbohydrate oxidation.

Back 22

False

Front 23

T/F: Ca2+ is gathered back into storage at the end of a contraction by passive mechanisms, which require no ATP.

Back 23

False

Front 24

T/F: If you change your training mode from aerobic endurance training to resistant training, you can dramatically influence the ratio of type I to type II fibres in your muscles.

Back 24

False

Front 25

T/F: For a very heavy lifting task, type IIx fibers are recruited first because they are most appropriate for the job.

Back 25

False

Front 26

T/F: If I need to lift a heavy box of books, I will be most successful if I try to lift it quickly and use momentum to help me.

Back 26

False

Front 27

T/F: The amount of energy used by a chemical reaction can be calculated based on the amount of heat that is released.

Back 27

True

Front 28

T/F: Anaerobic glycolysis can produce ATP in the absence of both oxygen and glucose.

Back 28

False

Front 29

T/F: ATP and PCr can both be used for feeling cellular work for brief but intense exercise bouts.

Back 29

False

Front 30

T/F: Free fatty acids can only be used to produce ATP via aerobic metabolic pathways.

Back 30

True

Front 31

T/F: The sympathetic nervous system is critical for appropriate response to exercise.

Back 31

True

Front 32

T/F: Motor units can contain multiple different types of muscle fibers.

Back 32

False