Answers on back of card:
which part of the brain detects a tempriture rise?
name two responses which help to cool the body:
which types of heat loss are caused by sweating (eg, conduction)
What kind of feedback is produced when the body is cooled to the correct tempriture?
Blood tempriture rises
Detected by hypothalumus
impulses are sent to effectors to cool the body
(eg, sweating and flushed skin- caused by vasodiatation and increased sweat secreation takes place)
skin tempriture rises
so heat loss increaes due to radiation and convection
and blood tempriture falls
then heat loss measures stop (negative feedback)
Answers on back of card:
where are nerve impluses in reflex archs sent?
where does the moter neuron leave the spinal cord?
which part of the spinal cord does the sensory neuron's synaps take place and to which neurone?
pain receptors in skin detect stimulus
sensory conducts nerve impluse to CNS
entering the spinal cord through dorsal route
sensory neuron synapses with interneuron in gray matter of spinal cord
this then synapes with moter neron
moter neurton leaves spinal cord through ventral root
and carries impluse to effector
making a synaptic connection with mucel (effector)
mucel contracts and hand is withdrawn
how rod cells work
Answers on the back:
When rhodopsin absorbs light what is the produce?
What creates an action potential in the eye?
what is the name of the inhibitory neurtotransmitter?
Which channels does opsin open?
how rod cells in the eye work
light enters retina
reaches vesicles in outer segment of rod cell
Rhodopsin absorbs light and is broken down into retinal and opsin
opsin closes Na+ channels in outer segment of rod cell
and is pumped out from the inner segment making the membrain hyperpolarised
this stops the release of an inhibitory neurotransmitter (glutamate) form the synapse of the rod cell
cation channels of the bipolar cell open because there is no inhibitory neurotransmitter
an action potential is produced in bipolar cell
this travels to the optic nerve
What do the Ca+ pass through to get into the mucell?
what happens to tropomyosin when troponin is pushed out of the way?
what causes the myosin head to be pulled to the center of the sarcomere?
Ca+ flood into mucel fibers through sarcoplasmic reticulem
they bind to troponin and change its shape
when this happens, tropomyosin is pushed out of the way
exposing the binding sights on actin molecules
myosin head binds to actin filiments and pulles it to the centre of the sarcomere
the myosin head hydolisises ATP providing eneregey for the release of the myosin head
the head then recocks for another cycle
what is the name of the neurotransmitter between the parasympethetic and moter neurone?
which neurone stimulates the circular mucells to contract?
what is the receptor cell called that detects light?
increasin levals of light fall on rod cells in retina
impulses travel along sensory neurons of optic nerve to the brain
and reach the center for co-ordinating pupil reflex
the impuses travel along the parasympathetic neurone to the moter neurone
(the neruotransmitter is acetile-choline)
moter neurone stimulates circular mucells in irus
which contract to decrease the size of the pupil