Response to stimuli

Question 1

Stimulus

Answer 1

A detectable change in the internal or external environment of an organism

Question 2

Response

Answer 2

Ability to respond to a stimuli

Question 3

Receptors

Answer 3

Specific to a type of stimulus

Question 4

Effectors

Answer 4

Response produced by a receptor

Question 5

Coordinator

Answer 5

Formulates a suitable response to a stimulus

Question 6

Taxis

Answer 6

A simple response whose direction is determined by the directions of the stimulus

Question 7

Kinesis

Answer 7

Response in which the organism does not move towards or away form the stimulus

Question 8

Tropism

Answer 8

The growth of part of a plant in response to a directional stimulus

Question 9

3 stimuli plants respond to:

Answer 9

1. light
2. gravity
3. water

Question 10

Plant growth factors

Answer 10

Plants responses to external stimuli involving hormone-link substance

Question 11

Indoleacetic acid (IAA)

Answer 11

example of a plant growth factor (from the group called auxins)

Question 12

Central nervous system

Answer 12

Made up the brain and the spinal cord

Question 13

Peripheral nervous system

Answer 13

Made up of pairs of nerves that originate from either the brain or spinal cord

Question 14

Sensory neurone

Answer 14

Carries the nerve impulse from receptors to the CNS

Question 15

Motor neurone

Answer 15

Carries nerve impulse away from the CNS

Question 16

Voluntary nervous system

Answer 16

Carries nerve impulses to the body muscles and under voluntary control

Question 17

Autonomic nervous system

Answer 17

Carries nerve impulses to glands, smooth muscle and cardiac muscles and is not under voluntary muscles

Question 18

Reflex

Answer 18

Type of involuntary response to a sensory stimulus

Question 19

Reflex arc

Answer 19

Pathway of neurones involved in a reflex

Question 20

4 importances of reflex arcs:

Answer 20

1. Involuntary
2. protect the body from harm
3. facts due to short neurone pathway
4. fast even if no decision is made

Question 21

Pacinian corpuscle

Answer 21

(receptor) responds to changes in mechanical pressure

Question 22

Transducer

Answer 22

Receptor cells that conserve light energy into electrical energy of a nerve impulse

Question 23

Rod cell

Answer 23

Cannot distinguish different wavelengths of light and leads to images being seen in black and white

Question 24

Cone cells

Answer 24

Respond to a different range of wavelengths (colour)

Question 25

Sympathetic nervous system

Answer 25

Stimulates effectors so speeds up any activity

Question 26

Parasympathetic nervous system

Answer 26

Inhibits effectors and so slows down any activity

Question 27

Antagonistic

Answer 27

One system contracts while the other relaxes

Question 28

Sinoatrial node

Answer 28

In the RA wall of the heart, i collects impulses and contracts impulse

Question 29

Atrioventricular node

Answer 29

In the atria, collects impulse, sends to purkyne fibres

Question 30

Medulla oblongata

Answer 30

Receptor in the brain

Question 31

Chemo receptor

Answer 31

Found in carotid artery walls and detect pH level