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nervous sys
Question | Answer |
---|---|
What are the three major sections of neuron | cell body, dendrites, axon |
what is the structural and functional unit of the NS | neuron |
what are the highly branched extension of the cell body | dendrites |
receptive surface of a neuron- conducts electrical signals toward the cell body | dendrites |
what are the three types of neurons | sensory neurons, interneurons, motor neurons |
afferent(arrive) and efferent(exit) neurons are another name for | sensory and motor |
these neurons are only located in the CNS and are connected neuron to neuron | interneurons |
carry messages from sensory receptors to the CNS | Sensory neurons |
what color are myelinated nerves; unmyelinated | white, gray |
schwann cells which are also _ cells make this substance | glia, myelin |
what is myelin | lipoprotein layer that covers some axons |
breaks or gaps betweent he schwann cells are called | nodes of raniver |
a nerve impusle 'jumping' from gap to gap is known as | saltatory |
myelinated neurons transmits an impulse _ mPS | 120 |
a nerve impulse that travels the entire length of the axon is called a | continuous conduction |
__ moves inside the cell causing an action potential | Na |
Na ions makes the inside of the membrane more __ than the outside | + |
the brief period after passage of the action potential is called the | refractory period |
what are the three types involved in synaptic conduction | presynaptic neuron; synaptic cleft; postsynaptic neuron |
which synaptic neuron is the transmittig neuron and which is receiving neuron | presynaptic neuron, and receiving neuron |
what is the most numerous transmitter in the peripheral NS- | acetylcholine (ACh) |
ACh is associated with the __ nervous system | parasympathetic |
Norepinephrine is associated with the __ nervous system | sympathatic |
uniform contraction are conducted by the _ synapses and where are they located | electrical; between smooth muscle cells and cardiac muscle |
what two factors influence the rate of conduction of the impulse | axon's diameter, presence or absence of a myelin sheath |
in relex actions neurons go to this structure first | spinal cord |
the most high-leve brain functions take place in the | cerebrum |
the frontal lobe assist in | planning, coordinating, controlling, and executing behavior |
SSSLIMWJ | are functions controlled by the frontal lobe |
intergrating sensory information from various parts of the body, knowledge of numbers and their relations, manipulation of objects, spatial processing | parietal lobe |
center for hearing, taste and smell, the dominant hemisphere receives and interprets sounds as words | temporal lobe |
functional visual areas | occipital lob |
coordinates body movements; maintains posture and balance | cerebellum |
relay station of all sensory input except vision | thalamus |
where is the thalamus located; between the two cerebral hemispheres | within the middle of the brain |
most primitive part of the brain and is responsible for sustaing the basic functions of life | the brain stem |
what are the three parts of the brain stem | midbrain, pons, medulla oblongata |
major relay stations for neurons transmitting signals to the cerebral cortex, as well as many reflex centers are found on what part of the midbrain | midbrain |
relay and reflex centers for vision and hearing are located in the | top portion of the midbrain |
reflex and relay centers relating to pain, temp, and touch as well as control of movement is located in the | bottom portion of the midbrain |
connect the two halves of the cerebellum, relay station linking the cerebral cortex and the medulla oblongata | pons |
touch, proprioception, pain, vibration and temperature sensory pathway | somatosensory |
what makes the CSF | choroid plexuses |
where is CSF reabsorbed into the bl | through the dural sinuses |
interconnected cavities within the cerebral hemispheres and brain stem | ventricles |
_ nerves int he PNS take impulses to and from the CNS | cranial |
_ nerves take impulses to and away from the spinal cord | spinal |
_ pathways that provide input from the body into the CNS | sensory |
_ pathways that carry signals to muscles and glands | motor |
The peripheral nervous system can be subdivided into the | somatic and autonomic nervous system |
oversees conscious activity | SNS |
oversees unconcious activity | ANS |
The ANS can be subdivided into the | sympathetic and parasympathetic nervous system |
sympathetic NS is associated with | fight or flight response |
parasympathetic NS is associated with | relaxation |