Test 5 CH 13 & 14 Flashcards
function of pns?
provides link to and from world outside body
function of sensory receptors?
respond to changes in environment; activation results in graded potentials that trigger nerve impulses
What are the 5 Classifications of receptors?
Mechanoreceptors, thermoceptors, photoreceptors, chemoreceptors, nociceptors
What do chemoreceptors respond to?
chemicals, smell. taste, changes in blood chemistry
What do photoreceptors respond to?
light energy ex. retina ..proteins change shape due to the sun
What receptors are responsible for pain?
Nociceptors
What are the 3 location of receptors?
Exteroceptors, interoceptors, and proprioceptors
What structure of nerve ending is found nearly everywhere throughout the body?
Free nerve endings
What stimulus does a modified free nerve ending respond to?
Mechanoreceptors/light pressure slow adapting
Do nociceptors adapt?
no
Where are hair follicle receptors located?
Exteroceptors
What is phasic adaptation?
signal beginning or the end of stimulus
What does tonic receptor do?
sustained response; adapts slowly or not at all…eg. nociceptors
Encapsulated nerves?
easy to stimulate; fiber terminals enclosed in a CT covering
Two types of peripheral nerves
Cranial and spinal nerves
Sensory nerves impulse goes …
toward the CNS
Mixed nerves are..
both sensory and motor fibers mixed with signals going to and from the CNS
motor nerves impulses…
away from the CNS
Most nerves are…
mixed nerves
Are pure sensory nerves rare?
yes
What is the function of the cranial nerves mnemonic?
Some say marry money but my brother says big brains matter more
How many pairs of spinal nerves are there?
31 pairs of mixed nerves
how many cervical nerves?
Thoracic?
Lumbar?
Sacral?
Coccygeal?
8 Cervical
12 Thoracic
5 Lumbar
5 Sacral
1 Coccygeal
What does Dorsal Root contain?
contain sensory fibers from sensory neruons in dorsal root ganglion – carry afferent impulses