Psych 3 Midterm

Front 1

The point at which information is carried from one neuron to the next neuron is called the
synapse

Back 1

True. The point of contact between two neurons is the synapse

Front 2

A spinal reflex involves at least one interneuron in the spinal cord

Back 2

False. Some reflexes, such as the stretch reflex, do not involve any interneurons

Front 3

Neurons in the medulla, the pons and the midbrain contribute to the reticular formation

Back 3

True

Front 4

. A neurochemical signal is terminated by _______________, _______________ and
_____________.
a. reuptake, regression, elimination
b. reuptake, degradation, diffusion
c. reuptake, degradation, transmission
d. reuptake, rupture, recapture

Back 4

B

Front 5

What is the difference between depolarization and hyperpolarization of the neuronal
membrane?
a. Depolarization results from the action of potassium ions; hyperpolarization
results from the action of sodium ions
b. Depolarization is a change in voltage to a less negative value; hyperpolarization
is a change in voltage to a more negative value
c. Depolarization makes the membrane potential positive; hyperpolarization makes
it negative
d. Depolarization is a small change to the membrane potential; hyperpolarization is
a large change

Back 5

B. Depolarization refers to when the membrane potential becomes more positive
(Or the inside of the neuron becomes more positive). It does not mean that the
membrane potential has to be positive-just become more positive. In contrast,
hyperpolarization refers to when the membrane potential becomes more negative
(Or the inside of the cell is becoming more negative).

Front 6

The somatic nervous system consists of
a. the 12 pairs of cranial nerves and the 31 pairs of spinal nerves.
b. the sensory and motor tracts in the spinal cord.
c. the motor neurons that operate the skeletal muscles and the sensory neurons that
bring information into the central nervous system.
d. the spinal cord and the brain

Back 6

C. The somatic nervous system is part of peripheral nervous system (PNS). Thus it
does not include the spinal cord, the brain or any “tracts”. Some of the nerves of
the PNS belong to the autonomic nervous system and thus “A” is incorrect

Front 7

Compared to a mouse, which part of your brain is more developed?
a. Myencephalon
b. Metencephalon
c. Telencephalon
d. Mesencephalon

Back 7

C. The telencephalon includes the cortex which is highly developed in humans

Front 8

Neurons

Back 8

specialized cells that are capable of sending and receiving chemical signals. There are 100 billion neurons in the brain

Front 9

Interneurons

Back 9

in spinal cord and brain, very small processes

Front 10

polarity

Back 10

refers to the number of processes coming from the cell body (dendrites and axon)

Front 11

Lipid Bilayer

Back 11

2 layers of fat molecules, fat isolates the cell from chemical and electrical intervention from the outside.

Front 12

4 main parts of a neuron

Back 12

dendrite, soma, axon, terminal

Front 13

cells of the nervous system

Back 13

nuerons 10% information processing, glia 90% cells of supporting function

Front 14

dendrites

Back 14

unique for neuron cell, receives signals from other neurons. chemical info is obtained and converted to electrical info

Front 15

axon

Back 15

carries electrical info from cell body to the end of the neuron