nervous system

Question 1

dendrites

Answer 1

that recieve info

Question 2

axons

Answer 2

transmit info

Question 3

intracellular fluid

Answer 3

66% of total body water

Question 4

extracellular fluid

Answer 4

33% of total body water

Question 5

The ICF and ECF are separated by the…

Answer 5

cell membrane

Question 6

Structure of the Cell Membrane

Answer 6

Phospholipid bilayer

Phosphate heads (hydrophilic) on the surfaces
Lipid tails (hydrophobic) centrally.
Protein molecules are inserted into the bilayer.

Question 7

Na-K ATPase

Answer 7

pumps three Na+ from the cell and takes two K+ into the cell for each molecule of ATP - sets up an electrical gradient.
It is found in all parts of the body

Question 8

saltatory conduction

Answer 8

• action potential jumps along the axon, it skips the areas of the axon where myelin is present
• leaving other parts of the nerve membrane un-depolarized

Question 9

Neurotransmitters are

Answer 9

Broken down by enzymes or
Undergo reuptake into the presynaptic neurone

Question 10

Glutamate

Answer 10

• major excitatory neurotransmitter
• opens Na+ channels in postsynaptic membrane – cause excitatory postsynaptic potentials (EPSPs)

Question 11

GABA

Answer 11

• major inhibitory neurotransmitter
• opens Cl - channels in postsynaptic membrane – cause inhibitory postsynaptic potentials (IPSPs)

Question 12

Acetylcholine

Answer 12

• can be excitatory or inhibitory in the brain
• excitatory in the muscle

Question 13

summation

Answer 13

One EPSP isn’t enough to produce an action potential – a bigger stimulus is needed.
This is achieved by summation.

Question 14

Motor or Efferent neurons

Answer 14

involved in sending instructions from the CNS to the muscles and glands

Question 15

Interneurons

Answer 15

involved in integrating and coordinating the information it receives and determining the action required

Question 16

Sensory or Afferent neurons

Answer 16

involved in sending information from the body and sense organs to the CNS