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EXTRA HELP EXXAM 3
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Describe the neuromuscular junction.
Motor: Axon terminals of motor neurons
Muscle: Skeletal muscle fiber
Midway: Exactly where they meet
Describe the relationship between the number of fibers in a motor unit and the precision of body movements.
Fewer fibers = finer movements
Define depolarization, and describe the events that follow it.
SOdium in (Depolorization)
POtassium out (Repolarization)
“SO-IN , PO-OUT”
Compare concentric and eccentric contractions.
Concentric = Contracting
Eccentric = Elongating
Explain the function of sodium-potassium ion pumps.
3-2-1 NOK
3 Sodium out, 2 Potassium in.
Name the three types of muscle tissue, identify where they are found, and list their functions.
Skeletal = Pull: It’s attached to bones and pulls to create movement.
Cardiac = Pump: Forms heart and pumps “propels” blood.
Smooth = Push: It’s in hollow tubes like the gut and pushes substances through.
Compare the central and peripheral nervous system.
Central (CNS): Core. Controls brain and spinal cord.
Peripheral (PNS): Outside. Nervous tissue outside central and enteric.
Define excitatory postsynaptic potential (EPSP) and inhibitory postsynaptic potential (IPSP).
EPSP = Excited (Entrance of positive ions) Graded depolarization. Gets closer to firing.
IPSP = Inhibited graded hyperpolarization. To keep from firing.