Biology- Central Nervous System

What are the 2 roles of the CNS

\-Allows humans to react to their surroundings

\-Co-ordinates their behaviour

What does a motor neurone do?

Carry nerve impulses away from CNS

What does a relay neurone do?

Carries nerve impulses within the CNS

What does a sensory neurone do?

Carry nerve impulses to the CNS

What is the chain of components from a stimulus to a response?

Stimulus →Receptor →CNS →Effector → Response

What does the cerebral cortex control?

\-Motor function

\-Decision making

What does the medulla control?

\-Reflexes/unconscious actions (breathing)

What does the cerebrum control?

Balance

What is A?

Cerebrum

What is B?

Cerebellum

What is C?

Medulla

Why are neurons insulated by a myelin sheath?

\-To speed up impulses

\-Prevent short-circuiting

What is a synapse?

A gap between 2 neurones which allows chemical neurotransmitters to diffuse across the gap

What is A?

Pre-synaptic membrane

What is B?

Post-synaptic membrane

What is C?

A vesicle

What D?

Neurotransmitters

What is a reflex action?

An automatic response to a stimulus

What does a reflex action not involve?

The brain

What does a reflex action do?

Protect body from harm

How fast is a reflex action in comparison to a regular response?

Much more rapid

What is the sequence of components in a reflex action?

Stimulus → Spinal cord → Effector → Response