*A&P 1 Unit 12 (Lab) [The Nervous System: Nervous Tissue] Flashcards
Name the two cell types found in nervous tissue.
- Neurons
- Neuroglial Cells
Which cells are responsible for sending the electrical messages called action potentials?
Neurons
What is another name for action potentials?
Nerve impulses
The 3 Structural Areas of a Neuron
- Cell Body
- Axon
- Dendrites
Which structure contains the nucleus?
Cell Body
Which structure receives messages from other neurons?
Dendrites
Which structure produces and transmits the action potential?
Axon
What do nuclei and ganglia have in common? How are they different?
- Nuclei- clusters of cell bodies in Central Nervous System (CNS)
- Ganglia- clusters of cell bodies in Peripheral Nervous System (PNS)
What is the axolemma?
An axon’s plasma membrane
Where does a neuron store its synaptic vesicles containing neurotransmitters?
Axon Terminal
When an action potential travels “down” (along) an axon and arrives at the axon terminals, they release the neurotransmitters by exocytosis. What is the prupose of neurotransmitter release?
Sends to another target across the synaptic cleft, which can be another neuron.
Describe the function of dendrites.
Receive messages from other neurons. They transmit these messages to the neuron’s cell body, but they are not capable of generating action potentials.
Can dendrites produce action potentials?
No
3 Structural Classifications of Neurons
- Bipolar
- Unipolar
- Multipolar
Which type of neurons has more than two processes (extensions) from its cell body? Is its axon the longer process or its dendrites?
Multipolar
Axon is longer
Which type of neurons has only one process- a very short one- extending directly from its cell body? And what structure branches in both directions (T’s) from this single process?
Unipolar
Axon