Section 6 Flashcards
What is the definition for nervous tissue, and what role does it play in conjunction with the endocrine system?
- tissue specialized for rapid transmission of signals from cell to cell
- works along with the endocrine system to coordinate homeostasis and body activities
What are the two types of nervous systems?
Central nervous system and peripheral nervous system
What components make up the central nervous system?
The brain and the spinal cord
What parts make up the peripheral nervous system
- Somatic Nervous System
- Autonomic Nervous System
— sympathetic
— parasympathetic - Enteric Nervous System
What is a neuron?
Nerve cell
What are the 3main parts of a neuron?
Cell body
Dendrites
Axon
Where is the nucleus located (generally) within a neuron?
Centrally
Cell bodies contain what two parts?
Nissl bodies and rough endoplasmic reticulum
What is the functions of dendrites?
The long extensions receive signals and then transmit them to the nucleus
What is the difference between axon signals and dendritic signals
Axons send signals across or to the synapse of a nerve while dendrites send signals to the nucleus in the cell body
What is the region where the axon joins the cell body
Axon hillock
What are the names for the cytoplasm and cell membrane of an axon
Axoplasm and axolemma
What is an axon collateral?
Branches that come off the axon
What is the synaptic end bulb and what is typically found in this structure?
The end of the axon that contacts the synapse
Typically houses vesicles that contain neurotransmitters
What is the region where the axon communicates with the end organ?
The synapse
What are the two types of axonal transport systems?
Fast axonal transport and slow axonal transport
In what direction does fast axonal transport move material?
Moves material along the axon in both directions via synaptic vesicles
In what direction does slow axonal transport move materials? What material is it moving?
This mechanism transports axoplasm from the cell body toward the synapse
What is a myelin sheath and what is the name of the region that is located below it?
A lipid/protein coating that surrounds the axons of certain neurons and the region called the Node of Ranvier is located below it
Where are multipolar neurons found and what is the ratio of dendrites to axons?
Many dendrites to one axon
Found in the brain and spinal cord
Where are bipolar neurons typically found and what is the axon and dendrite ratio?
Typically found in the eyes and ears and has one axon and one dendrite