Unit 5: Notes 1 Flashcards
what are the three basic functions of the nervous system
sensory, integrative, motor
describe sensory
- sensory receptors detect/collect stimuli in/out of body
- sensory or a ferret neurons carry info to brain via spine and cranial nerves
describe integrative
processes information
describe motor
- response to sensory stimuli
- Motor or efferent neurons carry info from brain effectors (muscles or glands) via cranial or spinal nerves
what are the two main parts of the nervous system
Central nervous system and peripheral nervous system
describe the central nervous system
- Brain and spinal cord
- processes info and creates a response that is delivered through the PNS
- source of thoughts, emotion and memories
describe The three divisions of PNS
- somatic: voluntary
- autonomic: involuntary
- enteric: involuntary “Brain of gut”
describe the peripheral nervous system
- nerves fibers and support cells
- collect info about internal/external environment
what does the somatic nervous system consists of
- sensory neurons convey info from sensory receptors to the CNS
- Motor neurons conduct impulses from CNS to skeletal muscles only
what does the autonomic nervous system consists of
- sensory neurons convey info from autonomic receptors in visceral organs to CNS
- Motor neurons conduct impulses from the CNS to smooth muscle, cardiac muscle and glands
- sympathetic, fight or flight
- parasympathetic, rest and digest
what does the enteric nervous system consists of
- sensory neurons monitoring chemical changes in gastric intestinal tract
- Motor neurons that govern contractions of G.I. smooth muscles and secretions of organs
how do the PNS and CNS communicate
electrical signals that are transmitted by neurons
what’s are the three types of neurons
sensory, motor, Interneurons
describe sensory neuron
Carry impulses to CNS from sensory organs (afferent pathway)
describe motor neuron
impulses from the CNS to muscles and glands (effectors)(efferent pathway)
describe interneurons
send info between sensory neurons and motor neurons
what are the two types of nervous tissue
- neurons - nerve cell
2. neuroglia - nerve support cell
what are the three main parts to a neuron
- cell body: contains a nucleus and organelles
- dendrite: receiving end
- axon: conducts impulses towards another neuron
what are the additional parts to the neuron
axon hillock, axon collateral, axon terminal, and synapse
describe the axon hillock
small hill where axon join cell body and where action potential starts
describe axon collateral
Side branches of axon
axon terminal
distal end of, forms junction with other cells/glands
synapse
where to neurons communicate via neurotransmitters
what’s my prevent electrical conductivity from passing to the next neuron
drugs
