Flashcards in Nervous Tissue and Neuroglia Deck (35)
Sensation function of the nervous system:
Input to the system. Ability to sense something internally or externally via receptors.
Integration function of the nervous system:
filtering component of prioritization and ignoring, and sending the most important info first.
Response function of the nervous system:
the mediation of the appropriate response; the most important answer
the brain and the spinal cord
Peripheral Nervous System:
everything that extends off of the CNS
1) cranial nerves
2) spinal nerves
These make up the entire PNS
sensory nerves, contain receptors that go right to the CNS
motor nerves, coming from the CNS to effector organs (muscles)
info that travels back out
2 parts of the Efferent NS
1) Somatic NS
2) Autonomic NS
responsible for Conscious Movement. Voluntary. Uses skeletal muscles.
What neurotransmitter is used in the somatic NS?
responsible for unconscious movement. deals with smooth and cardiac muscles and glands.
What neurotransmitters are used in the autonomic NS?
ACh and Norepinephrine (NorEpi)
Two branches of the Autonomic NS:
The rest and digest nervous system. Decreases things.... like heart rate. However, concerning digestive organs, it increases.
The fight or flight nervous system. Increases things... like heart rate. However concerning the digestive organs, it decreases secretion and stuff.
What are the basic structural and functional unit of the NS?
Neurons are Amitotic. True or False.
True. They're unable to perform mitosis. They don't reproduce, because they last forever.
What are the supportive tissues for the neurons called?
Dendrites concerning sensory info:
bring information into cell body.
Responsibility of each dendrite are greater when there are a greater amount of dendrites in a particular area?
No. More dendrites, the less responsibility each dendrite has. There are a lot of dendrites in your upper lip, less in your lower back.
Axons concerning motor info:
carry info out
3 classifications of neurons:
1) Sensory or Afferent Neurons
2) Interneurons or Association Neurons
3) Motor or Efferent Neurons
Sensory or Afferent Neurons:
Part of the PNS and bring info into the CNS
Interneurons or Association Neurons:
involved in the integration of info and connect sensory neurons to motor neurons
Motor or Efferent Neurons:
Bring info from CNS to effector organ
6 types of Neuroglia:
2) Ependymal cells
3) Microglial Cells
6) Satellite Cells
What do neuroglial cells do?
They provide the environment for an action potential to take place and never perform an action potential.
They have cytoplasmic extensions that come off of them and wrap capillaries, forming lining and coverings, and keep the extracellular fluid constant.
Line the ventricles of the brain, and line the central canal of the spinal cord.