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BIOLOGY TOPIC 5.2 : HUMAN NERVOUS SYSTEM - Coggle Diagram
BIOLOGY TOPIC 5.2 : HUMAN NERVOUS SYSTEM
function
transmission
receptor
detects a stimuls
coordinator
central nervous system
brain
spinal cord
carry out a response
effector
muscle
glands
via neurones
sensory neurone
detects a stimuls
relay neurone
transmits signal from sensory neurone to relay neurone
motor neurone
transmits impulse to effector
allows reaction to surroundings and the condition of actions
reflex arc
subconscious
importance
protection
fast and automatic
brain structure
cerebellum
balance
coordination
muscle movement
medulla
non-voluntary movements
breathing
heart rate
cerebral cortex
conscious thought
language
personality
investigation + treatment
difficulties
complex
delicate
membranes prevent some drugs from reaching the brain
methods
MRI
electrical stimulation
studying patients with brain damage (comparison of symptoms)
temperature
too high
sweating increases
vasodilation
too low
shivering
sweating stops
vasoconstruction
detects blood temperature
coordinator
receptors in skin
the eye
disorders
myopia
lens too curved
light is focused on the front of the retina on it
hyperopia
lens
light focused on the back of the retina
treatment
replacement lens
glasses
contact lens
laser eye surgery
accommodation
focusing
close objects
ciliary muscles contract
suspensory ligaments losen
stronger refracttion
lens thickens
distant objects
lens thinner
weaker refraction
suspensory ligaments contract
ciliary muscles losen
suspensory ligament + ciliary muscle
controls the shape of the eye
structure
sclera
white tough outer layers, protects internal structures
retina
light sensitive layer on the back of the eye
iris
contracts / relaxes to control the amount of light entering the eye
optic nerve
carries impulses from brain to the eye
cornea
allows light into the eye to focus on the retina