Hormonal vs Nervous Control

Question 1

What is a change in internal/ external environment called?

Answer 1

Stimulus

Question 2

What detects stimulus?

Answer 2

Receptors

Question 3

What responds to the stimulus?

Answer 3

Effectors

Question 4

How do receptors and effectors communicate?

Answer 4

Through the nervous system, and/or the hormonal system

Question 5

What does the central nervous system consist of?

Answer 5

Brain, and spinal chord only

Question 6

What do receptors in a sense organ do when they detect a stimulus?

Answer 6

Send electrical impulses along sensory neurones to the CNS

Question 7

Where does the CNS send electrical impulses to?

Answer 7

To an effector along the motor neurone

Question 8

What is the job of the Central Nervous System?

Answer 8

To coordinate response

Question 9

What does a coordinated response always need?

Answer 9

• Stimulus
• Receptor
• Effector

Question 10

Why does the nervous system need very rapid responses?

Answer 10

Neurones transmit high speed electrical impulses

Question 11

How is a nerve signal transferred over a synapse?

Answer 11

Transferred by chemicals (neurotransmitters)which diffuse across the gap

Question 12

How do nerves act?

Answer 12

• Very fast messages
• Act for a short time
• Act on a precise area

Question 13

How do hormones act?

Answer 13

• Slower messages
• Act for a longer time
• Act in a more general way