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Definition of homeostasis
A automatic response to an external environment so that the body can maintian optimum internal environment
5 Steps of Homeostatic response
Stimuli
Receptor
Cooridinator
Effector
Response
What two organs does the Motor neurone effect as the effector a stimuli
Muscles / Glands
Where is the sensory neurone found?
CNS & Spinal Cord
what is the role of the sensory neurone?
to relay info to interneurone and recieve info from receptors
Where is the Interneurone/ relay neurone found?
CNS
What is the role of the interneurone
To relay/recieve info to/from other neurones
Where is the motor neurone found?
CNS & PNS
What is the role of the motor neurone
to relay info the muscles/glands & recieve info form other neurones
PNS
peripheral nervous system
What happens in relation to Auxin if one side of the plant is illuminted?
the dark side accumilatez more auxin, as the extra growth on the dark sides causes the growing shoot to grow towards the light source
tropism
a growth response to a stimulus
types of tropisms
Phototropisims- toward light
geotropism / gravitropism - earth
hydrotropism- water
what is Auxin?
A growth hormone that elungates cells and diffuses away from the light.
What acryonm can I use to remember the parts of an eye- what does each letter stand for?
C ornea
A queous humor
P upil
I ris
L ense
S uspensory ligment
C illiary muscle
V itreous humor
R etina
C horoid
S clera
O ptic nerve
what does the eye do when there a bright light?
The radial muscles relax circular muscles contract
what does the eye do when there is a dim light?
The radial muscles contract & circular muslces relax
Accomodation reflex when focussing on far objects
lens get thinner(refracts) by suspensory ligments & ciliary muscles relax
Accomodation reflex when focussing on close objects
lens need to be thick to refract light by suspensory ligment moving lens into natural shape & Ciliary muscles contrast, putting less tensions
what is a co-ordinator example in reflexes
sensory nuerones transfer info to interneurone in the spinal cord via synapses, which can be relyaed to brain, and to an impulse
what is a effecter example in reflexes
motor neurone send electrical impluse along its axon onto muscle. The muscle (in this case) is the effector.
what is a synapse
junction between axon terminal & dendrites of two neurones.
