Search for notes by fellow students, in your own course and all over the country.
Browse our notes for titles which look like what you need, you can preview any of the notes via a sample of the contents. After you're happy these are the notes you're after simply pop them into your shopping cart.
Title: Nervous System
Description: For those taking up biology first year. This is about the frog's nervous system. Easy to study, understand, and remember. Enjoy, hope this helps you..
Description: For those taking up biology first year. This is about the frog's nervous system. Easy to study, understand, and remember. Enjoy, hope this helps you..
Document Preview
Extracts from the notes are below, to see the PDF you'll receive please use the links above
Nervous Tissue
Wednesday, 24 November 2021
12:58 AM
Nervous System
• provides its rapid and precise communication between different parts of the body
via the actions of specialized nervous cells called Neurons
Neurons
○ interconnected and functional to gather and process information and
generate appropriate response signal
• main function is conductivity
Main Components
○ neurons
○ nerve cells
○ neuroglia [supporting cells]
□ includes astrocytes, microglia, Schwann cells, ependymal cells
Neurons
○ nerve cells that are responsible for transmitting signals
Glia Cells
○ nonconducting cells that are responsible for supporting the growth
and development of the neurons
Excitability
○ disruption of the plasma membrane
Ø changes in the concentration is a direct response to the external
stimuli
○ involves transiently changing the membrane permeability in response to
appropriate stimuli so that the ionic gradient is partially reversed and
plasma membrane loses its electrical potential - depolarized
The Neurons
Cell Body
Ø large spherical/ovoid nucleus with conspicuous nucleolus
§ Nissl Bodies
□ clumps of bluish material scattered in the cell body and dendrites
Dendrite
Ø short and numerous branching processes radiating from the cell body
Axon
Ø single, thin, long process from the cell body
Ø may be wrapped or ensheathed by myelin [Nodes of Ranvier] located at regular intervals
Ø terminate at branching and twig-like endings [Telondendria] with small swellings at each
terminal twig
§ terminal buttons - swelling
Title: Nervous System
Description: For those taking up biology first year. This is about the frog's nervous system. Easy to study, understand, and remember. Enjoy, hope this helps you..
Description: For those taking up biology first year. This is about the frog's nervous system. Easy to study, understand, and remember. Enjoy, hope this helps you..