week 4 - neurons / brain

Question 1

what are the two broad catagories of the nervous system ?

Answer 1

CNS

peripheral: sends info/stimuli to and from CNS

Question 2

what are the different categories of the peripheral nervous system?

Answer 2

somatic and automic
- autonomic: controls involuntary responses/basic life processes
- somatic: sensory info to and from CNS, semi intentioanl
autonomic
1. sympathetic 2. parasympathetic
- sympathtic: ready for action, response to threat/fight or flight
- parasympathetic: calms the person down, rest

Question 3

what is “fire action” of a neuron?

Answer 3

When stimulus or electrical signal is sent from one neuron to another which causes a big enough change between the charges between the membrane fluid and extracellular fluid. Na+ ions flood the membrane from pening of channels which further DEPOLARISE the membrane

Question 4

what are the different types of neurons? there are 3!

Answer 4

afferant or sensory neurons: collects sensory stimuli from body cells (organs, skin) and sends it to CNS
efferent or motor neurons: sends electrical signals from the brain to muscles/glands in the body (do something about that spider)
interneurons or association neurons: live in CNS and sends impulses between motor and sensory neurons

Question 5

what is a neuron?

Answer 5

a type of cell that responds to stimuli and sends electrical signals throughout the body to respond accordingly

Question 6

what are the components that make up a neuron? and what are their functions?

Answer 6

dendrites: pick up signals/messages from other neurons and convery info to its own body
axon: sends electrical signals to other surrounding neurons