practical 2: reflex and response Flashcards
a rapid, predictable response to a stimulus
reflex
the pathway along which the electrical signal travel
reflex arc
what are the 5 parts of reflex arc
receptor, sensory (affarent), integration center, motor (efferent) neuron, effector
detects a stimulus
receptor
sends an electrical signal to cns
sensory (affarent) neuron
consists of one or more synapses in the cns and processes the information
integration center
sends electrical signal from cns to effector
motor (efferent) neuron
responds appropriately
effector
has only one synapse
monosynaptic
what kind of synapse is pattelar reflex
monosynaptic
most relflexes are
polysynaptic
the more synapses involved,
the longer the reflex takes
eyes allow visualization of our surroundings by processing — that is received through the —of the eye
light stimuli; retina
in response to light, this reflex constricts the pupil thru the innervation of the iris sphincter muscle
pupillary light reflex
what muscles adjust during pupillary light reflex
muscles connected to lens, ciliary bodies, and muscles that make up iris
-stimulated by several nerves
what happens to pupils when lights turn on
constrict to reduce the amount of light entering eyes, protecting the retina
what is the purpose of pupillary light reflex
regulate the intensity of light entering the eye by constricting or dilating the pupil
what are the receptors and effectors in the pupillary light reflex test
receptor= photoreceptors/ retina
effector= inner circular muscle of iris
what role does symp and para nerv system play in pupillary reflex
symp= causes dilation
para= cause constriction
which cranial nerve causes blinking reflex
trigeminal= affarent
facial = efferent
also called stretch reflex
patellar reflex
initiated by tapping the patellar ligament, stretching the muscle, and stim the muscle spindle to cause a reflex contraction of quad
stretch reflex
functions of stretch reflex
maintain posture, balance, and locomotion
purpose of patellar reflex
prevent quad muscle from overstretching
why is patellar reflex faster than other reflexes
monosynaptic reflex- only involves one synapse btwn sensory and motor neurons
are reflexes somatic or autonomic
both
somatic-skeletal reflex
autonomic- smooth muscle, cardiac muscle, and glands/ this is to maintain internal homeostasis and regulation
what are the stim, receptor, affarent, efferent, effector or pupil constriction (parasymp)
stim= light
receptor= photoreceptors/ retina
affarent= optic nerve
efferent= oculomotor
effector= inner circular muscle of iris
what happens to our eyes when the light turns off
eyes dilate to try to allow more light to see.
what muscle causes eye dilation
outer radial muscle of iris
what are the stim, receptor, affarent, efferent, effector of blink reflex
stim= touch, light
affarent= trigeminal
efferent= oculomotor, facial
effector= orbicularis oculi
