Chromatography columns are considered to consist of a number of adjacent zones in each of which there is sufficient space for an analyte to completely equilibrate between the two phases, Each zone is called a theoretical plate (having no N).

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#Id: 5414

#Unit 7. System Physiology – Animal

Astrocytes, which are found throughout the brain, are of two subtypes:

Fibrous astrocytes

Protoplasmic astrocytes

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#Unit 7. System Physiology – Animal

Fibrous astrocytes, contain many intermediate filaments are found primarily in white matter.Protoplasmic astrocytes are found in gray matter and have a granular cytoplasm.

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#Unit 7. System Physiology – Animal

Both Astrocytes

send processes to blood vessels, where they induce capillaries to form the tight junctions making up the blood–brain barrier send processes that envelop synapses and the surface of nerve cells.

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#Unit 7. System Physiology – Animal

Protoplasmic astrocytes produce substances that are tropic to neurons, & they help maintain the appropriate concentration of ions & neurotransmitters by taking up K+ & neurotransmitters glutamate & γ-aminobutyrate (GABA)

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#Unit 7. System Physiology – Animal

Ependymal cells are ciliated-epithelial glial cells that develop from radial glia along the surface of the ventricles of the brain and the spinal canal & play a critical role in cerebrospinal fluid homeostasis, brain metabolism, and the clearance of waste from the brain.

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#Unit 7. System Physiology – Animal

Neurons generally have four important zones:

A dendritic zone, where multiple local potential changes generated by synaptic connections are integrated. a site where propagated action potentials are generated. an axonal process that transmits propagated impulses to the nerve endings the nerve endings, where action potentials cause the release of synaptic transmitters.