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Org. Nervous System

Physiology Week 5

What does the central nervous system consist of and what is it responsible for? Consists of the brain & spinal cord. Responsible for integrating, processing & coordinating sensory data & motor commands.
What does the peripheral nervous system consist of? Includes all the neural tissue outside the CNS.
Function of the peripheral nervous system? Its sensory division brings info to the CNS from receptors in peripheral tissues and organs. Its motor division carries motor commands from CNS to peripheral tissues & systems.
List and describe the 3 types of sensory receptors that PNS involves 1. Somatic sensory receptors provide position, touch, pressure, pain & temp sensations. 2. Special sensory receptors provide sensations of smell, taste, vision, balance & hearing. 3. Visceral sensory receptors monitor internal organs
List and describe the 2 types of nervous systems that are involved in motor division in PNS The somatic nervous system controls skeletal muscle contractions. The autonomic nervous system provides automatic regulation of smooth & cardiac muscle, glands and adipose tissue,
What are neurons? Building blocks of the nervous system
Why can neurone communicate and what with? Neurons can communicate with each other, muscles & glands because they are excitable
Three characteristic structural features of neurons. All neurone have a cell body, receptive portion & transmitting portion. 1. In most neurone, the cell body/soma is located centrally 2. multiple branching processes called dendrites extend from the soma. 3. A thin single axon also extends from the soma
What is the Cell body of a Neuron and what is its function? Neuron structure is related to function. The cell body is the main nutritional & metabolic region of the neurone. Like the dendrites, it receives signals from other cells & sends them toward the ion.
Explain the function of dendrites The branched dendrites receive signals coming in from other cells and send them toward the axon
Explain the function of Axons The axon generates an action potential, an outgoing signal also called a nerve impulse and conducts it to the next cell. The axon is the transmitting or conductive region of the neurone.
Axons vary in length. Can they seen from naked eye? Axons can be short or longer however even if they are long they cannot be seen from naked eye as they are very thin
Which cells are responsible for insulating myelin? Schwann Cells
Explain the general function of neurone Neurons receive & integrate signals at one location & transmit an action potential at another location.
Where are signals received? Explain. Signals from other neurone are received at synapses, the junctions b/w neurons.
Where is the action potential (outgoing signal) generated and where is it conducted? Generated at the axon hillock and conducted along the axon to axon terminal
Function of satellite support cell Behave like a cushion, produces insulation b/w cell bodies and help neurone for nourishment.
Function of Astrocyte support cell Provides link b/w capillaries & neurone. Help with nourishment of neurons & regulate ions.
Oligodendrocyte support cell Similar to schwann cell in function. Responsible for myelination in central nervous system.
List the 3 types of neurone sensory, inter & motor
What are inside nerves ? - Inside nerves there are arteries, myleinated fibres, less myelinated fibres, un-myelinated fibres
Which fibres conduct signals faster? Which signal goes in and which goes out? - The conduction of signals are much faster in myelinated fibres. - Sensory signal goes in, motor goes out.
Unipolar vs. Bipolar unipolar: only one neurite extends from cell body. Bipolar: 2 ""
List 2 multipolar neurone and describe features Pyramidial neuron: best & most important. Originate from cortex and goes to opposite side of body and produces movement in the body. Spinal Motor Neuron: Originate from anterior part of spinal cord and goes towards muscle.
Created by: meunid



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