Nondisjunction

TLS Online TPP Program

#Id: 5412

#Unit 7. System Physiology – Animal

Oligodendrocytes are involved in myelin formation around axons in the CNS.

TLS Online TPP Program

#Id: 5413

#Unit 7. System Physiology – Animal

Schwann cells are involved in myelin formation around axons in the peripheral nervous system.

TLS Online TPP Program

#Id: 5414

#Unit 7. System Physiology – Animal

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

Fibrous astrocytes

Protoplasmic astrocytes

TLS Online TPP Program

#Id: 5415

#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.

TLS Online TPP Program

#Id: 5416

#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.

TLS Online TPP Program

#Id: 5417

#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)