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: 5190

#Unit 7. System Physiology – Animal

Active factor XII then activates  factor XI, & active factor XI activates factor IX.

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#Id: 5191

#Unit 7. System Physiology – Animal

Activated factor IX forms a complex with active factor VIII, which is activated when it is separated from von Willebrand factor.

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#Id: 5192

#Unit 7. System Physiology – Animal

The complex of IXa and VIIIa activate factor X. 

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#Id: 5193

#Unit 7. System Physiology – Animal

Phospholipids from aggregated platelets and Ca2+ are necessary for full activation of factor X.

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#Id: 5194

#Unit 7. System Physiology – Animal

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

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#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.