2j coord and response Flashcards

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1
Q

define homeostatis

A

maintaneince of a constant internal environent = body water content and temp

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2
Q

describe the process of synapses

A
  1. electrical impulse travels along axon
  2. triggers nerve-ending of nuerone to release the chemical messengerss = neurotransmitters
  3. neurotransmitters diffuse across synape and bond w receptor molecules on next neruone
  4. receptor moleucles bidn only to the specific neurotransmitters released
  5. stimulates the recieving neurone to transmit the electrical ip
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3
Q

optic nerve

A

carries the impulse from retina to brain

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4
Q

retina

A

made up of light sensitive reeptor cells = rode and cone cells

convert light –> electrical energy

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5
Q

rod cells

A

sensitive to low light intensity
MORE sensitive > cones

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6
Q

cone cells

A

sensitive to colour

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7
Q

sclera

A

tough outer layer of eye
protects eye and holds it in place

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8
Q

cornea

A

-transparent sclera at the front
- refracts light, bending it to enter the eye

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9
Q

iris

A
  • has a set of muscles that control the size fo the pupil
  • regulates amnt of light reaching retina
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10
Q

cilliary + suspensory

A
  • changes shape of lens to focus lightrays on retina
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11
Q

choroud

A
  • underneath sclera
  • dark layer contains pigment cells + bv which stop light from being reflected aorund inside
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12
Q

fovea

A

centre of retina, highest cones conc

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13
Q

blidn spot

A

no rods and no cones

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14
Q

lens

A

focuses light rays on retina

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15
Q

pupil

A

hole in the iris
allows light to pass through

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16
Q

where does light refraction to form an image hapoens?

A

cornea
lens

17
Q

iris reflex, DIM LIGHT

A
  • circular muscles relax
  • radial muscles contract
    = dialation
18
Q

iris reflex, NRIGHT LIGHT

A
  • circular msucles contract
  • radial msucles relax
    = contraction
19
Q

accomadation, CLOSE

A
  • cilliary muscles contract –> choroid towards lens
  • susnpesnoary ligaments relax
  • lens thicker
20
Q

accomadation, FAR

A
  • Cilliary muscles relax –>choroid away from lens
  • suspensory ligamanets contral
  • lens becomes flatter
21
Q

what hormones released from pituitray?

A

FSH, ADH, LH