Bio40A Lab quiz 1
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What does the CNS consist of
The Brain and the Spinal Cord
What are the two nervous systems?
- 1) CNS=central nervous system
- 2) PNS=peripheral nervous system
What does the Peripheral nervous system consist of?
Anything outside of the Brain and Spinal cord
What does nervous tissue create?
- 1) Brain
- 2) Spinal Cord
- 3) Nerves
A bundle of hundreds to thousands of axons of neurons that are part of the PNS
What are the two general categories of nerves?
Cranial nerves and spinal nerves
How many nerves do the cranial have
how many nerves does the spinal have
- 31 nerves
What are the two types of cells that make up the nervous system?
Neuron cells and neuroglia cells
What is the function of neuron cells
They receive and transmit information-rarely divide
What is the function of neuroglia cells
support,protect, provide nutrients and increase the travel speed of information
Define motor neuron
a neuron that innervates and stimulates a muscle cell or gland
What is the function of Dendrites?
send and receive signals from other nerve cells or sensory receptors
What is the function of neuron axon?
an axon relays action potential to other nerve cells or glands
What is the function of neuron cell axon hillock?
Axon hillock connects the cell body to the axon
what is the function of the initial segment in a neuron cell?
Inital segment starts action potential
What is the function of axon collateral?
an axon collateral sends information to other nerve cells or glands
what is the function of an axon terminal in a neuron cell?
fine processes at the ends of axons
What is the function of the synaptic end bulb in a neuron cell?
store and release neurotransmitters
What is? and what is the function of myelin sheath in a neuron cell?
its a multi-layered lipid and protein covering that insulates the axon and increases the travel speed of nerve impulse
What are Nodes of ranvier?
gaps in the myelin sheath along the length of the axon
What is a Schwann cell and what is its function?
flattened cells that encircle PNS axons and produce myelin sheath, it allows action potential to leap across
what is the difference between a neuron cell and a neuroglia cell?
Neurons receive and transmit information and the neuroglia cell support the neurons
How many types of neuroglia cells are there?
there are four types of neuroglia cells
what are the four types of neuroglia cells?
- 1) Astrocytes cells
- 2) Oligodendrocytes cells
- 3) Microglia cells
- 4) Ependimal cells
What is the function of Astrocytes neuroglia cells?
- 1)provide physical support
- 2)creates brain blood barrier
- 3)regulates growth,migration and interconnection among neurons
- 4)play a role learning a memory
- 5)maintain proper chemical environment for neurons
What is the function of Oligodendrocytes cells?
they support and produce myelin sheath
What is the function of a microglia cell?
They act as the first and main ACTIVE immune defense in the CNS. Microglia phagocytize pathogens within the CNS.
What is the function of Ependimal neuroglia cells?
produce cerebral spinal fluid
What are the two neuron cells used in the PNS?
- 1) Schwann cells
- 2) Satellite cells
What is the function of a schwann cell?
They produce myelin sheath, help in cell regeneration and allow action potential to leap from one side to the other
what is the function of satellite cells in the PNS?
insulates cell from surrounding environment.
How many types of nervous tissue are there?
- six types
- 1-Astrocytes cells
- 2-Oligodendrocytes cells
- 3-Microglia cells
- 4-Ependimal cells
- 5-Schwann cells
- 6-satellite cells
Which cell type lines the ventricles of the central nervous system?
Which cell forms myelin in the CNS
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