ch 3

Card Set Information

ch 3
2011-01-22 18:15:46

Show Answers:

  1. a primary neurotransmitter that transmits impulses across the synaptic cleft
  2. a rapid and substantial depolarization of the membrane of a neuron or muscle cell that is conducted through the cell
    action potential
  3. the sensory division of the peripheral nervous system
    afferent division
  4. a part of the neuron, between the cell body and the axon, that controls traffic down the axon through summation of excitatory and inhibitory postsynaptic potentials
    axon hillock
  5. one of numerous branched endings of an axon - terminal fibril
    axon terminal
  6. system consisting of the brain and spinal cord
    central nervous system (CNS)
  7. a decrease in the electrical potential across a membrane, as when the inside of a neuron becomes less negative relative to the outside.
  8. the motor division of the peripheral nervous system
    efferent division
  9. branches coming off the ends of the axons leading to the axon terminals
    end branches
  10. a depolarization of the postsynaptic membrane caused by an excitatory impulse
    excitatory post synaptic potential (EPSP)
  11. a sensory receptor in a muscle tendon that monitors tension
    Golgi tendon organ
  12. a localized change (depolarization or hyperpolarization) in the membrane potential
    graded potential
  13. an increase in the electrical potential across a membrane
  14. a hyperpolarization of the postsynaptic membrane caused by an inhibitory impulse
    inhibitory postsynaptic potential (IPSP)
  15. efferent division
    motor division
  16. an involuntary motor response to a given stimulus
    motor reflex
  17. a sensory receptor located in the muscle that senses how much the muscle is stretched
    muscle spindle
  18. the outer covering of a myhelinated nerve fiber, formed by a fatlike substance called myelin
    myelin sheath
  19. the electrical signal conducted along a neuron, which can be transmitted to another neuron or an end organ such as a group of muscle fibers
    nerve impulse
  20. the site at which a motor neuron communicates with a muscle fiber
    neuromuscular junction
  21. a specialized cell in the nervous system responsible for generating and transmitting nerve impulses
  22. a chemical used for communication between a neuron and another cell
  23. a catecholamine released from the adrenal medulla tht, along with epinephrine, prepares the body for a fight-or-flight response. It is also a neurotransmitter
  24. that section of the nervous system through which motor nerve impulses are transmitted from the brain and spinal cord to the periphery and sensory nerve impulses are transmitted from the periphery to the brain and spinal cord
    peripheral nervous system (PNS)
  25. the potential difference between the electrical charges inside a cell and outside the cell, caused by a separation of charges across the membrane
    resting membrane potential (RMP)
  26. the means of rapid nerve impules conduction along myelinated neurons
    saltatory conduction
  27. the process by which the sensory and motor systems communicate and coordinate with each other
    sensory motor integration
  28. an enzyme called Na+=K+-ATPase, which maintains the resting membrane potential in disequilibrium at -70mV
    sodium-potassium pump
  29. the summing of all individual changes in a neuron's membrane potential
  30. the junctions between two neurons
  31. a minimum amount of stimulus needed to elicit a response. Also, the minimum depolarization required to produce an action potential in neurons