This suppression of recombination allows alleles adapted to a specific environment to remain together, unshuffled by recombinationsomes cannot produce viable progeny. 

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#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

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#Id: 6527

#Unit 7. System Physiology – Animal

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

the acini

the islets of Langerhans

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#Id: 6528

#Unit 7. System Physiology – Animal

Insulin, 

synthesized and secreted 

by the β cells

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#Id: 6529

#Unit 7. System Physiology – Animal

Insulin has an AB heterodimer structure with 

One intrachain (A6-A11) 

Two interchain disulfide bridges (A7-B7 and A20-B19)

TLS Online TPP Program

#Id: 6530

#Unit 7. System Physiology – Animal