Wk 2 BB

Question 1

Most neurons have the following structures:

Answer 1

: 1. soma (cell body); 2.
dendrites (branches); 3. axon; 4. terminal buttons (terminals, bouton)

Question 2

Interneurons

Answer 2

lie entirely within the CNS and are involved in cognition
(i.e.,perceiving, learning, remembering and executive functioning such as decision
making).

Question 3

According to their function neurons can be divided into:

Answer 3

Sensory neurons

Motor neurons-

Interneurons

Question 4

Multipolar neuron –

Answer 4

neuron with
one axon and many dendrites
attached to its soma.

Question 5

Bipolar Neuron –

Answer 5

neuron with
one axon and one dendrite
attached it its soma.

Question 6

Unipolar Neuron

Answer 6

neuron with
one axon attached to its soma;
the axon divides, with one
branch receiving sensory
information and the other
sending the information into the
central nervous system.

Question 7

Astrocytes

Answer 7

“star cells”

Provide physical support to neurons

Provide nourishment

when neurones die, they clean uo debris and form scar tissue

Question 8

Oligodendrocytes

Answer 8

produce myelin sheath -

Question 9

The Blood-Brain Barrier

Answer 9

A semipermeable barrier between the CNS and circulatory system,
which helps to regulate the flow of nutrient rich fluid into the brain.

Question 10

Area Postrema

Answer 10

– a region of the medulla where the blood-brain
barrier is weak. This allows toxins in the blood to stimulate this area,
which initiates vomiting – poison expelled from the body

Question 11

Neuronal integration

Answer 11

Process by which inhibitory and excitatory postsynaptic potentials
summate and control the rate of firing of a neuron.