APHY 201 Outline 3 Exam Questions with Correct Answers

APHY 201 Outline 3 Exam Questions with Correct Answers


Question 1:
Dendrite
Answer:
....Short, branch-like processes where incoming signals are recieved


Question 2:
Terminal bouton
Answer:
....Tiny button-like swelling where presynaptic release of neurotransmitter occurs


Question 3:
Axis Cylinder (axon)
Answer:
....Where the action potential first appears; conduction of the action potential away from the
neuron cell body.


Question 4:
Soma
Answer:
....The part of the neuron where integration of excitatory and inhibitory signals occurs


Question 5:
Absolute refractory period
Answer:
....The time interval during which no stimulus can elicit an action potential in a nerve fiber is
called the:


Question 6:
In the sodium-potassium pump
Answer:
....potassium enters and sodium leaves the cell
The principle cause of early re-polarization of a nerve fiber after an adequate stimulus has been
applied

, Question 7:
is
Answer:
....an increase in the outward conductance of K+


Question 8:
The principle cause of depolarization of a nerve fiber when an adequate stimulus is applied is
Answer:
....an
increase in the inward conductance of Na+


Question 9:
Saltatory conduction
Answer:
....refers to conduction of a nerve impulse by a myelinated axon


Question 10:
Relative refractory period
Answer:
....The period of excitability during which a greater that normal strength of


Question 11:
The establishment and maintenance of a cell's resting membrane potential is dependent on -
....Selective permeability of the membrane to ions.
Answer:
stimulus is required to elicit a cell response is termed the:


Question 12:
The presence of non-diffusible anions inside the cell.
Answer:
Active transport of ions. Energy expenditure.


Question 13:
Potassium Ion
Answer:
....The hyper-polarization phase of the action potential is caused by too much leaving the cell.