T-Cell Development

a. Commitment of hematopoietic precursors to the T cell lineage

b. The initiation of antigen receptor gene rearrangements

c.  The selection and expansion of cells that have successfully rearranged one of their T-cell receptor genes (-selection).

TLS Online TPP Program

#Id: 6523

#Unit 7. System Physiology – Animal

Epinephrine and norepinephrine both act on α-and β-adrenergic receptors (adrenoceptors)

TLS Online TPP Program

#Id: 6524

#Unit 7. System Physiology – Animal

Five dopamine receptors fall into two major categories: D1 -like (D1 and D5 )  D2 -like (D2 , D3 , and D4 )

TLS Online TPP Program

#Id: 6525

#Unit 7. System Physiology – Animal

Norepinephrine produces vasoconstriction via  α1 receptors, but epinephrine dilates the blood vessels in skeletal muscle and liver via β2 receptors

TLS Online TPP Program

#Id: 6526

#Unit 7. System Physiology – Animal

Catecholamines increase the secretion of insulin and glucagon via β-adrenergic mechanisms and inhibit the secretion of these hormones via α-adrenergic mechanisms

TLS Online TPP Program

#Id: 6527

#Unit 7. System Physiology – Animal

The pancreas is composed of two major types of tissues, as: 

the acini

the islets of Langerhans

TLS Online TPP Program

#Id: 6528

#Unit 7. System Physiology – Animal

Insulin, 

synthesized and secreted 

by the β cells