Have an account?
Skip to Content
Build your own quiz
16 questions
Show Answers
See Preview
- 1. Multiple ChoiceThe segment of a myofibril that is called a sarcomere runs from _______________.one Z line to the next Z lineone H zone to the next H zoneone A band to the next A bandone end of a skeletal muscle to the opposite end
- 2. Multiple ChoiceInto what does the neuron release its neurotransmitter at the neuromuscular junction?motor end platecytoplasm of the muscle cellterminal cisternaesynapse
- 3. Multiple ChoiceA motor unit is made up of _______________.all the muscle fibers within a given musclea motor neuron and the muscle fibers it innervatesall the neurons going into an individual section of the bodya fascicle and a nerve
- 4. Multiple ChoiceThe crossbridges involved in muscle contraction are located on the ________________.myosin filamentsactin filamentstropomyosintroponin
- 5. Multiple ChoiceWhich of these statements is correct regarding muscle contraction?All motor units act togetherMuscle contraction continues for long periods after nervous stimulation ceasesThe crossbridges bind to the actin and shorten the sarcomeresTroponin is not needed to strengthen the contracting muscle cell.
- 6. Multiple ChoiceWhich of the following is a component of a thin filament?actinmyosintroponintropomyosin
- 7. Multiple ChoiceWhich of the following statements concerning the role of Ca2+ in the contraction of skeletal muscle is correct?The mitochondria act as a store of Ca2+ for the contractile processCa2+ entry across the plasma membrane is important in sustaining the contraction of skeletal muscleA rise in intracellular Ca2+allows myosin to interact with actinThe tension of a skeletal muscle fibre is partly regulated by G proteins.
- 8. Multiple ChoiceThe functional unit of the contractile system in skeletal muscle is(are)myofibrilscross-bridgessarcomeresZ-bands
- 9. Multiple ChoiceMuscle fatigue sets in due to the nonavailability ofcalciumATPactin binding sitessodium
- 10. Multiple ChoiceWhich of the following sets of ions are necessary in the chemical events of muscle contraction?sodium and potassiumiron and magnesiumsodium and calciumsodium and magnesium
- 11. Multiple ChoiceThe neurotransmitter always used at the neuromuscular junction is:epinephrinenoradrenalineacetylcholinedopamine
- 12. Multiple ChoiceWhich of the following steps occurs first?myosin heads attach to actinmyosin heads pivot pulling the actin filament toward the centercross-bridges detach from actin when a new ATP binds to myosinanother cross-bridge forms
- 13. Multiple ChoiceWhich of the following occurs when a muscle contracts?the distance between z-lines remains the samethe H-zone disappearsthe muscle strengthensthe distance between z-lines decreases
- 14. Multiple ChoiceIs skeletal muscle control considered voluntary or involuntary?VoluntaryInvoluntary
- 15. Multiple ChoiceAs I'm hiking through the woods, I come across a bear. Which nervous system will be firing inside my body?SympatheticParasympatheticSomaticAutonomic
- 16. Multiple ChoiceThe thick filament is called what?ActinSarcomereSarcolemmaMyosin
- Answer choicesTagsAnswer choicesTags