Flashcards
BI 232 Muscle Quiz 1 overview
Cards in this deck (16)
- 1When a skeletal muscle contracts to cause a given movement, the relatively stationary end of attachment of the muscle is termed?Origin
- 2This statement best describes the muscle property of "extensibility? a. muscles recoil to original shape b. muscles shorten forcefully c. muscles can stretch when needed d. muscles contract when stimulatedc. muscles can stretch when needed.
- 3These statements about creatine phosphate are true except: a. accumulates in cells to store energy b. ADP reacts with it to produce ATP c. creatine kinase is used as a catalyst d. supports intense exercise for up to 3 minutes.d. supports intense exercise for up to 3 minutes.
- 4These statements about myosin myofilaments are all true except:? a. are thicker than actin. b. make up the H zone. c. attached to the Z disc d. attached to filaments that form the M line.c. attached to the Z disc
- 5The resting membrane potential occurs when:? a. Na+ ions diffuse into the cell b. Na+ ions diffuse out of the cell. c. K+ ions diffuse into the cell. d. K+ ions diffuse out of the cell.d. K+ ions diffuse out of the cell.
- 6These events occur during contraction except:? a. exposure of active sites on actin. b. active transport of Ca+ back into sarcoplasmic reticulum c. cross-bridges are formed and released. d. power stroke.b. active transport of Ca+ back into sarcoplasmic reticulum.
- 7Depolarization must reach this value in a cell to trigger an action potential: a. 0 mv b. +20 mv c. -85 mv d. thresholdd. threshold
- 8This stimulus results in the greatest force of contraction because all motor units of a muscle are responding: a. threshold b. subthreshold c. maximal d. supramaximalc. maximal.
- 9List the events occurring at a neuromuscular junction in order. 1. ACh binds to receptors on postsynaptic membrane. 2 acetylcholinestrerase breaks down ACh 3. choline is reabsorbed by presynaptic membrane 4. depolarization of sarcolemma 5. ligand gated Na+ ion channels open a. 1,5,4,2,3 b. 5,3,2,1,4 c. 1,4,2,3,5 d. 1,5,2,3,4,a. 1,5,4,2,3
- 10This kind of contraction results in an increase of tension, but the length of the muscle does not change: a. isometric b. isotonic c. concentric d. eccentrica. isometric
- 11These conditions occur in both physiologic contracture and rigor mortis except: a. low levels of ATP b. cross-bridges are formed c. release of cross-bridges d. Ca2+ builds up in the sarcoplasm 3. active transport of Ca2+ slows or stops.c. release of cross-bridges.
- 12Given the following: 1. Ca2+ ions are actively transported back into sarcoplasmic reticulum 2. Troponin-tropomyosin complexed move to inhibit cross-bridge formation 3. muscle fibers lengthen passively These events best describe? a. treppe b. lag phase c. contraction phase d. relaxation phased. relaxation phase.
- 13Johnny's primary source of energy comes from this as he runs on his treadmill for 20 minutes every morning?: a. stored ATP b. aerobic respiration c. anaerobic respiration d. creatine phosphate.b. aerobic respiration
- 14This statement is true about anaerobic respiration: a. produces 38 ATPs per glucose molecule b. uses fatty acids for sustained exercises. c. can produce ATP rapidly d. uses citric acid cycle.c. can produce ATP rapidly.
- 15These are the most important neurotransmitters that regulate smooth muscle: a. acetylcholine, dopamine b. norepinephrine, dopamine c. acetylcholine, norepinephrine, d. GABA, Achc. acetylcholine, norepinephrine.
- 16Because large amounts of ATP are stored in muscle fibers, it does not need to be continuously synthesized in order to sustain muscle contraction a. true b. false.b. false.
Information
- Description
- Biology Muscle Flashcards on BI 232 Muscle Quiz 1 overview, created by dancedrill on 01/07/2013.
- Created by
- dancedrill
- Views
- 175
- Tags
- Rating