4 The synaptic vesicles contain… AcetylcholineCalcium ionsMyoglobinactin
5 The process by which a motor neuron releases acetylcholine is ExocytosisSimple diffusionActive transportfiltration
6 What structures meet at the neuromuscular junction? T-tubules and the sarcoplasmic reticulumThe sarcolemma and the T-tubulesThe axon of the motor neuron and the sarcolemmaThe axon of the motor neuron and myosin
13 Creatine phosphate serves to Cause the decomposition of ATPCause the decomposition of ADPSupply energy for the synthesis of ATPSupply energy for the change of ATP to ADP
14 The all-or-none response means… All the muscles in a region contract togetherAll of the muscle fibers/cells within a muscle contract togetherWhen a muscle fiber contracts, it contracts completely
15 Rigor mortis occurs because of Excessive ATP, which prevents muscle relaxationLack of ATP, which prevents muscle relaxation (no ATP to release crossbridge between actin & myosin)Excessive ATP which causes muscle contraction
16 The botulinus toxin that causes botulism acts by Preventing the release of acetylcholinePromoting the release of acetylcholineCausing acetylcholine to be decomposedPreventing the decomposition of acetylcholine
17 Smooth muscle is foundAttached to bonesLining hollow organs and tubesIn the wall of the heart
18 Muscle tissue that is striated and involuntary SkeletalSmoothCardiacBoth cardiac and smooth
19 A muscle cramp is likely due to a lack of ActinMyosinATPADP
20 Which of the following is the smallest MyofilamentMyofibrilMyofiberfascicleMyofibril is the organelle within the muscle cell/fiber and the myofilaments (actin & myosin) are the proteins within the myofibril.
21 Multiunit smooth muscle Is composed of sheets of muscle cellsTends to display rhythmicityOccurs in the walls of the stomach and intestinesNone of thesea, b, & c are all characteristics of visceral smooth muscle.
22 Striations are seen in… Osseous tissueSmooth muscleSkeletal muscle cellsTendons and ligaments
27 Myoglobin…Stores oxygen in the muscle tissueBinds to actin to shorten the myofibrilsStores ATPSeparates one sarcomere from another
28 Connective tissue that separates the fascicles in skeletal muscle is called the EpimysiumEndomysiumPerimysium
29 Connective components EpimysiumPerimysiumEndomysiumFascicleMuscle fiberConnective componentsof muscle organ
30 The sarcolemma is theStorage site for calciumCell membrane of a myofiberCytoplasm of myofiber
31 The function of the intercalated disks in cardiac muscle tissue is to Separate one sarcomere from anotherStore ATPSlow the rate at which calcium ions are returned to the sarcoplasmic reticulumProvide a mechanism by which all of the cells in a network can contract as a functional unit
32 The sliding filament theory states that when a muscle fiber shortens… Actin filaments become shorter when they combine with myosinThin myofilaments are pulled toward the center of the sarcomereMyosin heads rotate when they attach to actin, causing them to fold.
33 The function of calcium ions in skeletal muscle cell contraction is to Bind to receptors on the sarcolemmaBind to oxygen; for cellular respirationBind to the thin myofilament (actin) changing its shape so that the thick myofilament (myosin) can bind.
34 Skeletal muscles are stimulated to contract when… Calcium ions bind to the sarcolemmaAcetylcholine binds to receptors on the sarcolemma, causing the stimulus to spread through out the muscle cellATP is released from the sarcoplasmic reticulumOxygen binds to the hemoglobin
35 Sarcomeres are separated from one another by I bandsH zoneA bandsZ lines
36 The region of the sarcomere that contains thin myofilaments, but not thick myofilaments is the A bandI bandZ lineT-tubule