nervouse system

Question 1

what are the three types of neurons and what order do they going?

Answer 1

1. Sensory neuron.
2. Relay neuron.
3. Motoneuron.

Question 2

what are the two parts of the nervous system?

Answer 2

• Central nervous system: brain and spinal cord
• Peripheral nervous system: all the new ones around the body

Question 3

where do dendrons and axons go?

Answer 3

dendron score before the nucleus and axons go after

Question 4

How do identify motoneuron

Answer 4

has one large cell body and long axon

Question 5

how do identify a relay neurone?

Answer 5

Just one cell body

Question 6

How do you identify a sensory neuron?

Answer 6

The nucleus is halfway along

Question 7

what is the sodium potassium pump?

Answer 7

it sits in the membrane of the axon and steps up a potential difference but pumping 3Na+ out for every 2K- in

Question 8

what does the conc gradient set up by resting potential look like?

Answer 8

-high concentration of Na outside the membrane snd low inside
- low concentration of K outside the membrane and high inside the membrane

Question 9

why is the sodium potassium pump so important?

Answer 9

it how impulses travel along nerves

Question 10

how does an impulse travel along a nerve?

Answer 10

• the stimulus causes sofium channels on the acon to open allowing Na+ to diffuse doen the conc grandient into the acon
• the voltage in the axon increase and this opens up more sodium channels letting more Na+ in
• every the voltages reached +40mV which is an action potential and this release an impulse which travels down the nerve

Question 11

what is the summary of the function of resting and action potential?

Answer 11

• resting potential sets up the potential difference and concentration gradient
• action potential releases an impulse along the nerve

Question 12

despite the action potential graph;

Answer 12

resting potential/polarised - depolarising - action potential/ depolarised - polarising - hyper polarised - resting potential/polarised