The Brain

Question 1

Cerebral hemispheres

Answer 1

• divided into 2 hemispheres
• used for speech, memory, behaviour

Question 2

Cerebellum

Answer 2

• balance, posture, muscle activity

Question 3

Medulla oblongata

Answer 3

• controls breathing / heart rate
• reflexes

Question 4

Investigating brain

Answer 4

• surgery - electrodes are used to stimulate the brain

• CT scans —> more in depth pic of brain / little risk of damaging brain

Question 5

Which part of motor neurone is surrounded by myelin sheath

Answer 5

Axon

Question 6

Structure & Function of REFLEX ARC

Answer 6

FUNCTION
• a process that occurs in response to danger
• protects body from harm / allows quick reaction

REFLEX ARC PATHWAY
• RECEPTOR, SENSORY NEURONE, RELAY NEURONE, MOTOR NEURONE, EFFECTOR

• receptor - stimulus is picked up by receptor
• sensory neurone - impulse transmitted down sensory neurone to CNS
• relay neurone - CNS has synapses, impulses passed along relay neurone via release of neurotransmitters
• motor neurone - impulse moves from CNS to the effector through the motor neurone.
• effector then causes a protective response against the stimulus

1) impulses are sent from receptors to sensory neurone to CNS
2) impulse transmitted across a synapse to relay neurone (via release of neurotransmitters)
3) transferred across another synapse to motor neurone
4) travels along motor neurone to effector
Effector causes a protective response against stimulus