Biology

Question 1

what’s the nervous system made up of?

Answer 1

brain and spinal cord

Question 2

what’s the step-by-step process of the central nervous system?

Answer 2

1-nerves in our body send info via the spinal cord to the brain
2-the brain then processes this info and sends a message to the body through the spinal cord

Question 3

what do neurons do?

Answer 3

neurons in the brain pass messages along through electrical impulses/neurotransmitters
-neurotransmitters are released and cross the synaptic gap to be picked up by receptor sites

Question 4

what do dendrites do?

Answer 4

pick up signals m sense organs/other neurons

Question 5

what does the cell body do?

Answer 5

collects dendrites into one stronger signal

Question 6

what does the axon do?

Answer 6

carries the electrical nerve impulse down the length of the cell

Question 7

what does the myelin sheath do?

Answer 7

acts as insulation to speed up the conduction of the impulse and keep it travelling in 1 direction

Question 8

what’s the axon terminal?

Answer 8

where the synapse passes to the next neuron

Question 9

what are the 5 steps in the synaptic transmission and action potential?

Answer 9

1-action potential comes down axon to terminal
2-vesicles full of neurotransmitters move to the edge of the cell and release neurotransmitter into the gap
3-neurotransmitter drifts across the gap and bonds to a receptor (lock and key mechanism)
4-when enough are filled then a new action potential starts on the next cell
5-any used/excess neurotransmitters are reabsorbed to the pre-synaptic membrane

Question 10

what are neurotransmitters?

Answer 10

chemicals used to carry messages across the synaptic gap

different ones do different things