Biology

Question 1

The nervous system is made up of what and where do they go

Answer 1

They are made of nerve cells which go to all part of the body

Question 2

The body has a lot of what

Answer 2

Sensory receptors

Question 3

Different receptors detect what

Answer 3

Different stimuli

Question 4

When a stimulus is detected by receptors what happens

Answer 4

The information is converted to a nervous impulse

Question 5

The nervous impulse is sent where

Answer 5

It is sent along sensory neurones to the CNS

Question 6

Impulses travel through what

Answer 6

The CNS along relay neurones

Question 7

The CNS sends impulses where

Answer 7

CNS send impulses along a motor neurone to an effector

Question 8

All neurones have 4 things what are they

Answer 8

A cell body,dendrites,dendrons and an axon

Question 9

What do dendrites and dendrons do

Answer 9

They carry nervous impulses towards the the cell body

Question 10

What do axons do

Answer 10

Axons carry nervous impulses away from the cell body

Question 11

Axons are surrounded by what and what does it do

Answer 11

It’s is surrounded by a fatty material called myelin sheath this speeds up electrical impulse

Question 12

What is the function of the sensory neurone

Answer 12

Carries impulses from receptors to the CNS

Question 13

What is the function of the motor neurone

Answer 13

Carries impulses from CNS to effectors

Question 14

What is the function of the relay neurone

Answer 14

Carries impulses through the CNS

Question 15

Describe the structure of a sensory neurone

Answer 15

A sensory neurone has one long dendron and a short axon with a cell body in the middle

Question 16

What is a synapse

Answer 16

A synapse is where 2 neurones join together

Question 17

When a electrical impulse reach a synapse what happens to the chemicals

Answer 17

The chemicals called neurotransmitters move across the gap

Question 18

What do neurotransmitters set off

Answer 18

They set off a new electrical impulses in the next neurones

Question 19

Why do we use reflexes than normal response

Answer 19

We use reflexes because they are automatic this makes them quicker than normal responses

Question 20

What do reflexes help us do and give an example

Answer 20

They help to stop injuring yours e.g moving your hand away from a hot iron

Question 21

What is a reflex arc

Answer 21

A reflex arc is the info in a reflex from receptor to effector

Question 22

Where do neurones in reflex arcs go to

Answer 22

Neurones in reflex arcs go to the spinal cord or through an unconscious part of the brain

Question 23

What are the 5 steps of how a reflex arc works

Answer 23

1) Something will sting you detected by sensory neurones
2) Impulses are sent along a sensory neurone to CNS
3) In the CNS, relay neurones passes the impulses from sensory to motor neurone
4) Impulses are sent along the motor neurone to effector
5) The effector here is a muscle. Contracts to move your hand away