Nerves And Hormones

Question 1

WHAT IS THE NERVOUS SYSTEM

Answer 1

The nervous system enables humans to react to their surroundings and co-ordinated their behaviour

Question 2

THE ORDER FROM RECEPTOR TO EFFECTOR

Nervous system

Answer 2

1. Receptor
2. Sensory neuron
3. Relay neuron
4. Motor neuron
5. Effector
   Carries out action

Question 3

WHAT DOES THE SENSORY NEURON DO

Answer 3

Sensory neurons carry signals from receptors to the spinal chord and brain

Question 4

WHAT DOES THE MOTOR NEURON DO?

Answer 4

Motor neurons carry signals from the central nervous system to the effectors

Question 5

HOW ARE IMPULSES TRANSMITTED FROM THE SENSORY TO THE RELAY NEURON

Answer 5

1. The neuro transmitters diffuse across the synapse towards the relay neuron
2. Neuro transmitters bind to the receptors on the relay neuron which then triggers the electrical impulse
3. Once the impulse is transmitted they are released back into the sensory neuron

Question 6

WHAT IS A REFLEX ACTION

Answer 6

An automatic response that occurs very rapidly and without conscious control - no professing from the brain is required

Question 7

WHAT IS A SYNAPSE

Answer 7

A synapse is the gap between two neurons

Question 8

WHAT DOES THE CENTRAL NERVOUS SYSTEM CONSIST OF

Answer 8

The CNS consists of the brain and spinal cord

Question 9

WHAT ARE THE MAIN PARTS OF A LIGHT RECEPTOR (3 parts)

Answer 9

• nucleus
• cytoplasm
• cell membrane

Question 10

NAME THE 5 RECEPTORS AND THEIR STIMULI

Answer 10

Eyes —> light

Ears —> sound and position of head

Tongue —> chemicals in food

Nose —> chemicals in the air

Skin —> touch, pressure, pain and temperature