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Flashcards in Nerves And Hormones Deck (10):
1




WHAT IS THE NERVOUS SYSTEM

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

2



THE ORDER FROM RECEPTOR TO EFFECTOR
(Nervous system)

1. Receptor

2. Sensory neuron

3. Relay neuron

4. Motor neuron

5. Effector
Carries out action

3




WHAT DOES THE SENSORY NEURON DO

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

4




WHAT DOES THE MOTOR NEURON DO?

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

5




HOW ARE IMPULSES TRANSMITTED FROM THE SENSORY TO THE RELAY NEURON

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

6




WHAT IS A REFLEX ACTION

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

7




WHAT IS A SYNAPSE

A synapse is the gap between two neurons

8




WHAT DOES THE CENTRAL NERVOUS SYSTEM CONSIST OF

The CNS consists of the brain and spinal cord

9




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

• nucleus
• cytoplasm
• cell membrane

10




NAME THE 5 RECEPTORS AND THEIR STIMULI

Eyes —> light

Ears —> sound and position of head

Tongue —> chemicals in food

Nose —> chemicals in the air

Skin —> touch, pressure, pain and temperature