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biology - Coggle Diagram
biology
co-ordination and control
eyes
structure
cornea-focusses on things
pupil-opening controlled by iris
iris- how much light enters eye
ciliary muscles- contracts lens thick, relax it thins
suspensory ligament- attach lens to muscles
retina- light sensitive cells, rods and cones
optic nerve- impulses from retina to brain
fovea- most cones
conjunctiva- covers eye to prevent infection
iris reflex
dim light, pupils dilate, radial muscles contract
bright light- pupil constricts, circular muscles contract
accommodation- see objects at different distances
far away
relax cilary muscles, ligaments tight, lens thinned, less refraction of light
close
cilary muscles contract, ligaments slack, thick lens, more refraction
nerves
co-ordinated response
humans- nervous system or endocrine
receptors detect the stimuli, change energy into nerve impulses.
temperature, touch, sound, chemical
central nervous system, makes movement or reflex
puerperal nervous system, impulses to effectors
neurons
sensory
carry impulses to brain and spinal cord
relay
along CNS
motor
into effectors
motor structure
nucleus- all genetic information
dendrite- connects nuerons to other neurones
axon- carries electrical impulses
insulated axon, speeds up impulse
reflexes- automated actions no brain
uses neurone to get around body, motor to cause contractions
synappses-gap between neurones
neurotransmitters, diffuse across synapse, bind with receptor, stimulates second neurone so transmits electrical impulse.