Coordination and Response

Question 1

Stimulus is ?

Answer 1

A change in an animals surroundings

Question 2

Response is ?

Answer 2

A reaction to the change

Question 3

Receptor Organ

Answer 3

Are organs that detect the change

Question 4

Effector

Answer 4

Organs that bring about the response

Question 5

Stimulus —> ________ —> Coordination —> _________ —> Response

Answer 5

Stimulus —> Receptor —> Coordination —> Effector —> Response

Question 6

The role of the receptor is?

Answer 6

To detect the stimulus

Question 7

Define Homeostasis

Answer 7

Maintaining a constant internal environment despite external change

Question 8

State three conditions which need to be controlled within the body

Answer 8

• Temperature
• Water Levels
• Blood glucose concentration

Question 9

What are the three main parts to a coordinated response?

Answer 9

• A stimulus ( e.g temperature change)
• A receptor ( to detect the change)
• An effector ( to carry out the response)

Question 10

What does auxin trigger

Answer 10

Auxin triggers growth of the main stem of the plant

Question 11

What is phototropism and which part of a plant is positively phototrophic

Answer 11

Phototropism is the growth of a plant towards a light source. The shoots are positively phototrophic (they grow towards the light source

Question 12

What is geotropism and which part of a plant is positively geotropic?

Answer 12

Geotropism is the growth of a plant towards the pull of gravity. The roots are positively geotropic (they grow down in the same direction as the pull of gravity).

Question 13

Give 3 differences between nervous and hormonal communication

Answer 13

• Nervous communication uses nerve cells and impulses whereas hormones are secreted by glands and travel in the blood
• Nervous communication is generally much faster than hormonal communication
• Hormonal communication usually brings about longer lasting responses than nervous communication

Question 14

What is the difference between the central nervous system and the peripheral nervous system

Answer 14

The central nervous system is the brain and the spinal cord. The peripheral nervous system is every other part of the nervous system

Question 15

How is an impulse transmitted between two neurones

Answer 15

• The impulse reaches the end of one neurone
• A neurotransmitter is released and it diffuses across the gap
• A new impulse is triggered in the next neurone

Question 16

What type of neurone connects a receptor to the Central nervous system

Answer 16

A sensory neurone

Question 17

What type of neurone connects the Central nervous system to an effector

Answer 17

A motor neurone

Question 18

Describe the reflex arc

Answer 18

Stimulus detected by a receptor

impulse passed along sensory neurone to Central nervous system

impulse passed along motor neurone to effector

effector brings about the response