B10

Question 1

Homeostasis

Answer 1

The regulation of internal conditions of a cell or organism to maintain optimum conditions for function,in response to internal and external changes

Question 2

Receptors

Answer 2

Cells that detect changes in the internal or external environment

Question 3

Coordination centres

Answer 3

Areas that receive and process the information from the receptors.

Question 4

Effectors

Answer 4

Muscles or glands that bring about responses to the stimulus that has been received

Question 5

What does the nervous system do

Answer 5

It uses electrical impulses to allow you to react quickly to your surroundings

Question 6

What happens after the receptors sense a stimuli

Answer 6

The sensory nurones send the impluse to the CNS and that then develops a response and sends it to your motor nuerones that then make you react

Question 7

What is a nerve

Answer 7

Bundles of lots of neurones

Question 8

What is a reflex action

Answer 8

Actions that are automatic and do not need the conscious parts of the brain to get the reaction

Question 9

What is the path way of the reflex reactions

Answer 9

Stimulus - receptor - sensory neurone - relay neurone - effector - response

Question 10

Describe the steps if you were to touch a hot object

Answer 10

The receptor in your skin is stimulated an electrical impulse from a receptor and the impulse is sent from the sensory neurone to the synapse which releases a chemical and instead of going to the brain and to the motor neurone the impulse goes to the relay neurone and then to the motor neurone making you move away your hand quicker

Question 11

What is the brain made up of

Answer 11

Billions of interconnected neurones

Question 12

Name three parts to the brain

Answer 12

Cerebral cortex
Cerebellum
Medulla

Question 13

What does the medulla do

Answer 13

It is concerned with the unconscious activities in the body like breathing and heart beats

Question 14

What does the cerebral cortex do

Answer 14

It is concerned with consciousness, intelligence, memory and language

Question 15

What purpose does the cerebellum have

Answer 15

It is concerned with coordinating muscular activities and keeping balance

Question 16

How do scientists map people brains

Answer 16

They map them and check for signs of brain damage through looking at the picture of it generated by an mri scan

Question 17

Name all the parts to the eye

Answer 17

Ciliary muscle 
Retina
Sclera 
Optic nerve 
Lens 
Cornea
Pupil
Iris
Suspensory ligment

Question 18

What is the eye

Answer 18

A sensory organ containing receptors in the retina that are sensitive to light intensity and colour

Question 19

What does the iris do

Answer 19

It controls the size of the pupil and the amount of light entering the eye

Question 20

What does the suspensory ligaments do

Answer 20

change the shape of the lens to Focus light on the retina

Question 21

What does the optic nerve do

Answer 21

It carries impulses from the retina to the brain

Question 22

What is accomodation

Answer 22

Changing the shape of the lens to focus on the near or distant objects

Question 23

What do the ciliary muscles do to focus

Answer 23

They contract and the lens becomes thicker so it can refract the light strongly