Nervous system

Question 1

what does the nervous system allow you to do?

Answer 1

react to surroundings and coordinate

Question 2

Your nervous system carries electrical signals called what?

Answer 2

impulses

Question 3

How fast do the electrical signals travel and why do they travel this fast?

Answer 3

1-120m per second

to allow u to react quickly

Question 4

what are changes in the body known as ?

Answer 4

stimuli or stimulus

Question 5

stimulus are detected by cells called ?

Answer 5

receptors

Question 6

where would u find receptors that respond to pressure?

Answer 6

Skin

Question 7

How does your nervous system work?

Answer 7

sensory receptor detects stimuli

the info is passed along by impulses

the impulses travel along the sensory neurones

the sensory neurones travel impulses along to the CNS

the cell after the CNS that travels the impulses is called the motor neurone

The motor neurones carry the impulses to the effector organ to make them respond.

Question 8

effector organs are usually what?

Answer 8

muscles or glands

Question 9

what are automatic responses known as ?

Answer 9

reflex arcs

Question 10

why are reflexes very important

Answer 10

help avoid danger or harm

Question 11

reflex actions involve what neurones?

Answer 11

sensory neurones

motor neurones

relay neurones

Question 12

how does a reflex work?

Answer 12

an electrical impulse travels from the sensory receptor along the sensory neurone to the CNS

then it passes along a relay neurone and straight back along the motor neurone

the impulse arrives at the effector organ

Question 13

how do synapses work?

Answer 13

there are junctions/gaps between nerves called synapses

the impulses travelling along the neurone have to cross these synapses

when an impulse arrives at a junction between two neurones chemicals are released into the gap which cross the synapse.

the chemicals attach to the surface of the next neurone.

so a new impulse is set up.

Question 14

flowchart of a reflex arc ?

Answer 14

stimulus->receptor->coordinator(CNS)->effector->response

Question 15

flowchart of nervous system?

Answer 15

receptor->sensory neurone->CNS->motor neurone ->effector

Question 16

why is it important impulses in reflex arcs do not go to the brain?

Answer 16

They need to be very quick to avoid danger, so the shorter the distance they have to travel, the quicker you will react

Question 17

Explain why some actions, such as breathing and swallowing, are reflex actions, while others such as speaking and eating are under your conscious control

Answer 17

Refl ex actions that need to operate automatically, even when you are asleep, cannot rely on conscious thought processes, unlike speaking and eating, which we need to be able to choose when to do them

Question 18

What part of the nervous system is involved in reflex actions

Answer 18

spinal cord

Question 19

what are relay neurones ?

Answer 19

The nerve cells that carry signals from sensory neurones to motor neurones

Question 20

what are sensory neurones?

Answer 20

The nerve cells that carry signals as electrical impulses from the receptors in the sense organs to the central nervous system

Question 21

what are motor neurones?

Answer 21

The nerve cells that carry signals from the cemtral nervous system to the effector muscles or glands

Question 22

what does the CNS consist of?

Answer 22

brain and spinal cord

Question 23

What is a synapse?

Answer 23

The connection between 2 neurones