BSC 2085C Study Cards ( Chapter 9 )

BSC 2085C Study Cards ( Chapter 9 ) Proper application of RICE--rest, ice, compression, and elevation--can effectively control inflammation due to an ankle sprain. Why would compression provided by a correctly wrapped elastic Ace bandage be helpful in preventing further inflammation? - Answer- because it immobilizes/stabilizes an injured ankle. Why would inflammation of the knee joint be a "good thing" when there's been an acute quadriceps injury? - Answer- because fluid accumulation reduces joint movement The site where a motor neuron excites a skeletal muscle fiber is called the neuromuscular junction. Place the sequence of events that occur at the neuromuscular junction. - Answer- Ca2+ enters the axon terminal. Synaptic vesicles release ACh. ACh binds to ACh receptors. Ligand-gated cation channels open. Na+ enters and K+ exits. Membrane potential is less negative. Which of the following is/are mechanism(s) to end neural transmission at the neuromuscular junction? - Answer- * ACh is broken down into acetic acid and choline by the enzyme acetylcholinesterase (AChE). ACh binds to ACh receptors. * ACh diffuses away from the synaptic cleft. ACh is taken up by the axon terminal via endocytosis. Place the events that occur during excitation-contraction coupling in the correct order from left to right. - Answer- [ Starting: AP generated by Motor Neuron ] AP propagates along sarcolemma AP travels down T tubules to triads Voltage-sensitive proteins open Ca2+ channels Sarcoplasmic reticulum releases Ca2+ Ca2+ levels in sarcoplasm increase [ Ending: Contraction of Skeletal Muscle Fiber ] The Cross Bridge Cycle starts when _________. - Answer- Ca2+ from the sarcoplasmic reticulum binds to troponin. Place the steps that occur during a single Cross Bridge Cycle in the correct order from left to right. - Answer- [ Starting: ATP Hydrolosys activates the myosin head. ] The activated myosin head binds to actin, forming a cross bridge. ADP is released and myosin slides the thin filament toward the center of the sarcomere.