The SA node exhibits automaticity; it can spontaneously generate action potentials without neural input. 

TLS Online TPP Program

#Id: 1927

#Unit 4. Cell Communication and Cell Signaling

Lectin pathway

TLS Online TPP Program

#Id: 1928

#Unit 4. Cell Communication and Cell Signaling

Alternative pathway

TLS Online TPP Program

#Id: 1929

#Unit 4. Cell Communication and Cell Signaling

Alternative Properdin-Activated Pathway

TLS Online TPP Program

#Id: 1930

#Unit 4. Cell Communication and Cell Signaling

The Alternative Protease-Activated Pathway

Thrombin, could cleave the complement components C3 and C5.

TLS Online TPP Program

#Id: 1931

#Unit 4. Cell Communication and Cell Signaling

When blood platelets are activated during a clotting reaction, they release high concentrations of ATP and Ca2+ along with serine/threonine kinases. Phosphorylated C3b is less susceptible to proteolytic degradation than its unphosphorylated form

TLS Online TPP Program

#Id: 1932

#Unit 4. Cell Communication and Cell Signaling

The Three Complement Pathways Converge at the Formation of the C5 Convertase.