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Year 9 Biology all questions solved 100 accurately latest version
Year 9 Biology all questions solved 100 accurately latest version
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Year 9 Biologywhat is the nervous system-✔✔communication system, controls all parts
of your body
structure of CNS-✔✔made up of brain and spinal cord
CNS purpose-✔✔receives info from all over body, processes it and sends
out msgs that tell body how to respond
structure and purpose of PNS-✔✔made up of nerves that carry out nerve
impulses to & from CNS
brain purpose-✔✔control centre of body
tells diff parts of body what to do through NS nerve impulses
cerebrum-✔✔largest part of brain, made of 4 lobes
frontal lobe-✔✔higher thought (critical thinking, emotions)
occipital lobe-✔✔vision (colour, spatial awareness, movement)
parietal lobe-✔✔processes sensory info (4 other senses, body position)
cerebellum location + purpose-✔✔near rear, lower part of brain
responsible for balance, coordination + fine & gross motor movement
brainstem location-✔✔connects brain to spinal cord, located at base of
brain
brainstem purpose-✔✔responsible for many involuntary processes
(heartbeat, movement of stomach and intestines
midbrain location-✔✔top part of brainstem
, pons location-✔✔below midbrain
medulla location-✔✔bottom-most part of brain
hypothalamus location-✔✔directly above brainstem, below thalamus +
above pituitary gland
hypothalamus purpose-✔✔responsible for keeping body in a stable state:
homeostasis
white matter-✔✔parts of CNS that contain neurons covered in myelin
where axons are connecting diff parts of grey matter to eachother
grey matter-✔✔parts w/ mainly cell bodies, dendrites + synaptic terminals
where the “thinking” occurs
motor neurons-✔✔carry signals from CNS to effectors
effectors-✔✔muscle cells/glands
put messages into effect
sensory neurons-✔✔carry signals from cells in sense organs to CNS
e.g. pain receptors in neck
interneurons-✔✔link sensory neurons directly to motor neurons
only make connections with other neurons
axon-✔✔carries signal away from cell body to axon terminals
dendrite location-✔✔attached to cell body
dendrite-✔✔sensitive branches that receive info as electrical signals from
nerves near it
myelin sheath-✔✔fatty layer covering axon
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