BIOL 235 FINAL - Version D Athabasca University COMPLETE SOLUTION DOWNLOAD TO BOOST YOUR GRADES

Anatomy Final Exam Biol235 How much of the total body weight of an average adult is muscle tissue? a. 60-70% b. 20-30% c. 30-40% d. 40-50% e. 50-60% d. 40-50% The different types of muscle tissue differ from eac ...

Anatomy Final Exam Biol235 How much of the total body weight of an average adult is muscle tissue? a. 60-70% b. 20-30% c. 30-40% d. 40-50% e. 50-60% d. 40-50% The different types of muscle tissue differ from each other by a. microscopic anatomy. b. location. c. type of control. d. both microscopic anatomy and location. e. All of these choices are correct. e. All of these choices are correct. This is the property of muscle that gives it the ability to stretch without damage. a. electrical excitability b. thermogenesis c. extensibility d. contractility e. elasticity c. extensibility This is the outermost layer of connective tissue surrounding a skeletal muscle. a. tendon b. ligament c. endomysium d. epimysium e. perimysium d. epimysium The type of tendon formed when the connective tissue elements of a skeletal muscle extend as a broad flat layer. a. endomysium b. perimysium c. deep fascia Downloaded by Ian Mbogo ([email protected]) lOMoARcPSD|7822105 d. fascicle e. aponeurosis e. aponeurosis In neuromuscular junctions, synaptic vesicles containing acetylcholine are found suspended in the cytosol of a. synaptic end bulbs. b. axon collateral bulbs. c. tubule bulbs. d. neuromuscular bulbs. e. myelin bulbs. a. synaptic end bulbs. Which of the following correctly lists the sequence of structures that action potentials must move through to excite skeletal muscle contraction? a. axon of neuron, sarcolemma, T tubules b. muscle fiber, axon of neuron, myofibrils c. sarcolemma, axon of neuron, T tubules d. myofibrils, myofilaments, mitochondria e. T tubules, sarcolemma, myofilament a. axon of neuron, sarcolemma, T tubules The contractile organelles of a skeletal muscle fiber are thread-like structures called a. myofibrils. b. myoglobin. c. mitochondria. d. Z discs. e. M lines. a. myofibrils. Release of calcium from these structures triggers skeletal muscle contraction. a. myofibrils b. mitochondria c. terminal cisterns of sarcoplasmic reticulum d. T-tubules e. none of the answer choices c. terminal cisterns of sarcoplasmic reticulum Which of the following regions of a sarcomere contain thin filaments? a. I band b. A band c. H zone d. Both I band and A band. e. All of these answer choices are correct. d. Both I band and A band. Which of the following regions of the sarcomere contain thick filaments? a. zone of overlap b. A band c. H zone d. both A band and H zone e. All of these answer choices are correct e. All of these answer choices are correct Myofibrils contain a. contractile proteins. b. regulatory proteins. c. structural proteins. d. all of these answers are correct. d. all of these answers are correct. Which of the following functions as a motor protein in all three types of muscle tissue? a. tropomyosin b. actin c. myosin d. troponin e. titin c. myosin What regulatory proteins can be found in the thin filaments of skeletal muscle fibers? a. troponin and titin b. tropomyosin and myosin c. myosin and titin d. titin and tropomyosin e. tropomyosin and troponin e. tropomyosin and troponin Which of the regions of a sarcomere contain titin? a. the I band only b. the A band only c. the H zone only d. the zone of overlap only e. from M line to Z disc e. from M line to Z disc Which of the following proteins is used to reinforce the sarcolemma and to help transmit the tension generated by the sarcomeres to the tendons? a. tropomyosin b. actin c. dystrophin d. troponin e. myosin c. dystrophin During muscle contraction by the sliding filament mechanism, thin filaments are pulled towards the a. M line. b. I band. c. A band. d. Z disc. e. H zone. a. M line. Calcium ions are released from the sarcoplasmic reticulum into the cytosol a. at the beginning of a contraction. b. in response to acetylcholine binding to Ca2+ release channels. c. by active transport using Ca2+ pumps in the SR membrane. d. after the contraction ends. e. All of these answers are correct. a. at the beginning of a contraction. What energizes the myosin head? a. ATP hydrolysis reaction b. the actin filaments c. ADP synthesis d. calcium ions e. potassium ions a. ATP hydrolysis reaction Skeletal muscle contraction will continue to occur as long as the following chemicals are available in the cytosol of the muscle fiber. a. ACh and potassium ions b. calcium ions and ATP c. sodium ions and ATP d. ATP and acetylcholine (ACh) e. calcium and ACh b. calcium ions and ATP To stimulate skeletal muscle contraction, acetylcholine must cross the __________ of the neuromuscular junction and bind to receptors on the motor endplate. a. sarcolemma b. synaptic cleft c. transverse tubule d. synaptic end bulb e. node of Ranvier b. synaptic cleft Which of the following are commonly used to produce ATP during skeletal muscle contraction? a. creatine phosphate b. anaerobic cellular respiration c. aerobic cellular respiration d. All of these choices are correct. e. None of these choices are correct. d. All of these choices are correct. This consists of a somatic motor neuron and all the skeletal muscle fibers it stimulates. a. neuromuscular junction b. muscle unit c. multi-unit smooth muscle d. sarcomere e. motor unit e. motor unit