Physiological Psych (PSB 3002) Exam
1- UCF Questions and Answers
Functions of Ependymal cells - ANSWER-line brain (ventricles) and spinal cord
(central canal) and assist in producing, circulating and monitoring of Cerebrospinal
Fluid. In CNS
Synaptic cleft - ANSWER-The space in between each neuron
What is the process in which neurons fire? - ANSWER-1) neuron is at resting
potential
2)stimulation occurs
3)threshold reached
4)Membrane's polarity at the dendrite gets reversed (action potential generated)
5)Action potential jumps down the axon
6)Neurotransmitters are released into the synapse
7)Chemical message is transmitted to post synaptic neuron
8)resting potential restored
Polarization - ANSWER-Difference in charge between inside and outside (at rest
more negative inside with more potassium)
Resting Potential - ANSWER-when the neuron is not excited or inhibited
Difference in charge (polarization) when neuron is not firing ... again more negative
inside. {NA shut, K barely open; flows slowly}
Electrical Gradient - ANSWER-Distribution of Charge between inside and outside
(ions all around - inside and out - have a charge)
-More negative inside than out
-Usually a difference of - 70 millavolts
-The more positive, the more you want in. Potassium also wants in because it is
positive (but not AS positive as sodium)
Selective Permiability - ANSWER-Some ions can pass through the membrane more
easily than others. Membrane has "pores" or "gates" that can open or close to let
some ions in and keep others out.
Sodium-Pottasium pump - ANSWER-Maintains polarization by {proteins}
transporting 3 Sodium ions out while transporting 2 Potassium ions in. Potassium
more negative than sodium.
Concentration Gradient - ANSWER-The distribution of ions across the membrane
1- UCF Questions and Answers
Functions of Ependymal cells - ANSWER-line brain (ventricles) and spinal cord
(central canal) and assist in producing, circulating and monitoring of Cerebrospinal
Fluid. In CNS
Synaptic cleft - ANSWER-The space in between each neuron
What is the process in which neurons fire? - ANSWER-1) neuron is at resting
potential
2)stimulation occurs
3)threshold reached
4)Membrane's polarity at the dendrite gets reversed (action potential generated)
5)Action potential jumps down the axon
6)Neurotransmitters are released into the synapse
7)Chemical message is transmitted to post synaptic neuron
8)resting potential restored
Polarization - ANSWER-Difference in charge between inside and outside (at rest
more negative inside with more potassium)
Resting Potential - ANSWER-when the neuron is not excited or inhibited
Difference in charge (polarization) when neuron is not firing ... again more negative
inside. {NA shut, K barely open; flows slowly}
Electrical Gradient - ANSWER-Distribution of Charge between inside and outside
(ions all around - inside and out - have a charge)
-More negative inside than out
-Usually a difference of - 70 millavolts
-The more positive, the more you want in. Potassium also wants in because it is
positive (but not AS positive as sodium)
Selective Permiability - ANSWER-Some ions can pass through the membrane more
easily than others. Membrane has "pores" or "gates" that can open or close to let
some ions in and keep others out.
Sodium-Pottasium pump - ANSWER-Maintains polarization by {proteins}
transporting 3 Sodium ions out while transporting 2 Potassium ions in. Potassium
more negative than sodium.
Concentration Gradient - ANSWER-The distribution of ions across the membrane
