In any particular cell, most genes are expressed at a low level

Only a small number of genes, whose products are specialized for the cell type, are highly expressed.

mRNAs expressed at low levels overlap extensively when different cell types are compared.

The abundantly expressed mRNAs are usually specific for the cell type.

TLS Online TPP Program

#Id: 5194

#Unit 7. System Physiology – Animal

Factor X can be activated by either of two systems: Intrinsic system Extrinsic system

TLS Online TPP Program

#Id: 5195

#Unit 7. System Physiology – Animal

The extrinsic system is triggered by the release of tissue thromboplastin, a protein–phospholipid mixture that activates factor VII.

TLS Online TPP Program

#Id: 5196

#Unit 7. System Physiology – Animal

Tissue thromboplastin and factor VII activate factors IX and X.

TLS Online TPP Program

#Id: 5197

#Unit 7. System Physiology – Animal

In the presence of PL, Ca2+ , & factor V, activated factor X catalyzes the conversion of prothrombin to thrombin.

TLS Online TPP Program

#Id: 5198

#Unit 7. System Physiology – Animal

Thrombin is a serine protease that is formed from its circulating precursor, prothrombin, by the action of activated factor X.

TLS Online TPP Program

#Id: 5199

#Unit 7. System Physiology – Animal

The conversion of fibrinogen to fibrin is catalyzed by thrombin.