When a presynaptic neuron is stimulated in a patient's body by an ...

[justinmsk]

When a presynaptic neuron is stimulated in a patient's body by an electrical current, neurotrans-mitters are released from the:
 
  a. synapse.
  b. synaptic bouton.
  c. synaptic cleft.
  d. receptor.

Question 2

A cell was isolated from the CNS. A researcher revealed that its main function was to clear cel-lular debris. What type of cell is the researcher studying?
 
  a. Astrocyte
  b. Ependymal cell
  c. Microglia
  d. Schwann cell

[diana chang]

Answer to Question 1

ANS: B
When an impulse originates in a presynaptic neuron, the impulse reaches the vesicles, where chemicals (neurotransmitters) are stored in the synaptic bouton. Neurons are not physically con-tinuous with one another. The region between adjacent neurons is called a synapse. The synaptic cleft is the space between the neurons. Neurotransmitters attach to the receptor.

Answer to Question 2

ANS: C
Microglia remove debris (phagocytosis) in the CNS. Astrocytes and ependymal cells are neu-roglial cells and do not have phagocytic properties. Schwann cells help form the myelin sheath in the peripheral nervous system (PNS).