Concept Quiz 3

Question 1

Sensory Neurons

Answer 1

brings in information from body’s sense receptors

Question 2

inter neurons

Answer 2

the CNS neurons that relay information between sensory inputs and motor outputs

Question 3

motor neurons

Answer 3

Carry outgoing information from the CNS to muscles and glands

Question 4

Neurotransmitters (location and excitatory and inhibitory)

Answer 4

chemicals which facilitate communication between 2 neurons in the synapse

Location- synapse (synaptic gap)
Excitatory- enough neurons send excitatory signals, neuron fires
Inhibitory- if some neighboring neurons send inhibitory chemicals neuron will not fire

Question 5

Two ways synthetic drugs (or substances from nature) are designed to impact neurotransmitters: what are they called/how does each function?

Answer 5

Antagonist- drugs block normal neurotransmitter activity
Agonist- drugs boost normal neurotransmitter activity

Question 6

Action potential and it’s cause

Answer 6

sensory Neurons firing more often
sensory Neurons delivering to more neurons
First segment opens on axon at -55mv
From dendrite to axon terminals
* Messages carried (in one direction) by electrical impulses.
* Recorded as the all-or-none action potential (spike potential)

Question 7

Extra action potential stuff

Answer 7

• Resting potential at -70 inside cell.
• Nerve/neuron is stimulated at dendrite by a message from another neuron
• Chemical “reaction” causes the cell to reach -55mV at axon hillock
  First segment opens on axon (reaches +30 mV)
• Action potential fires!
• Moves down the axon toward terminal
  Jumps from Node (of Ranvier) to Node
• After each section fires, it
  “chemically” goes back to - 70mV for resting state
• Waits for the next message!