GCSE AQA BIOLOGY B1

Here is a powerpoint on unit 1 of biology.

It is incomplete (sorry) but when i do more / complete it....i will delete this one and upload that version,

There is quite a lot already here though :) (the first 3 out of 8 topics for B1)

i hope you find this useful...but i did write them for myself so there may be times when you're like 'whaaaaaaaaaat?' but fingers crossed you won't.

i made these notes from the AQA biology textbook, CGP Biology complete revision and GCSE BITESIZE (bbc)

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  • Created by: Taz
  • Created on: 01-05-10 20:09
Preview of GCSE AQA BIOLOGY B1

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1. The Nervous System
· N.S. uses electrical impulses to enable you to react to
your surroundings + co-ordinate behaviour
· Sense organs contain receptor cells which detect stimuli
- receptors change stimulus energy into electrical
impulses
· Neurones (nerve cells) transmit info (as electrical
impulses) v.quickly to and from CNS
· CNS where info from receptors is sent + where reflexes
and actions are co-ordinated.
· Effectors respond in diff. ways: - muscle contract
- glands secrete hormones
· STIMLULUS RECEPTOR SENSORY NEURONE
CNS (co-ordinator) MOTOR NEURONE EFFECTOR…read more

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Sensory Neurone:
Motor Neurone:…read more

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1. Reflexes
· Reflex actions are automatic, rapid responses to certain
stimuli
- reduce chances of injury because no thinking
about response: quicker: V.FAST
· Route taken by info in a reflex is reflex arc
- bypasses conscious areas of brain (usually through
spinal cord)
· STIMULUS RECEPTOR SENSORY NEURONE RELAY
NEURONE MOTOR NEURONE EFFECTOR
· e.g. of reflex:
- hand withdrawn from hot/sharp object
- shock hormone adrenaline released
- bright light pupils get smaller
- breathing/ moving food through gut…read more

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The Reflex arc in detail…read more

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1. Synapses
· Impulse arrives at synapse
· Sacs release chemicals
called neurotransmitters
· Chemicals diffuse across
gap (synapse)
· Chemicals arrive at
receptor sites on next
neurone
· This triggers a new
electrical impulse.…read more

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Comments

Ria

Very useful, got B1 exam coming up soon. Thanks :)

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