receptors Flashcards
reflex arc
stimulus
receptor
sensory neurone
intermediate neurone
motor neurone
effector
response
sensory neurone
impulses from receptor to spine/cns
intermediate neurone
in spinal cord. relays impulse from sensory to motor
motor neurone
impulse from spine to effector
taxes
directional stimulus
kinesis
non directional impulse
random
parcinian corpasile
single sensory neurone srrounded in connective tissue surrounded by layers seperated by gel
pressure sensetive
cones
colour vision
greatest density at fovea
contain pigment iodopsin
not sensetive to light
good visual acuity- each connected to bipolar neurone
rods
high density in peripheral
rhodopsin
sensetive to light
low visual acuity
control of the heart rate
san sends waves of electrical impulses to atrial walls
atria contract
non conductive collagen prevents passing onto ventricles
waves from SAN to AVN to bundle of his
delay during this - atria empty fully
bundle of his: conduct waves between ventricles to apex
splits into purkyne fibres
cause waves of electricty into ventricles, contract from bottom up
increase heart rate
baroreceptor or chemoreceptor in carotid arteries
more impulses sent down symathetic autonomic nervous system to oblongata
neurotransmitter secreted to SAN increase hr and stroke volume
decrease heart rate
baroreceptor or chemoreceptor
more impulses sent down parasymathetic autonomic nervous system
neurotransmitter secreted to decrease hr and stroke volume
