Question

Which of these actions is necessary for blood vessels to dilate?

• a.)

  Inhibition of antibody production

• b.)

  Inhibition of the complement system

• c.)

  Secretion of histamines

• d.)

  Concentration of macrophages

Answer 1

Answer) c. Secretion s of histamines

We already know that Injured tissue that is mast cells release histamine. T​​​​​​​​​his histamine causes the surrounding blood vessels to dilate and raise in permeability. Similarly histamine also releases vascular smooth muscle cell relaxants, like for instanc nitric oxide, endothelium-derived hyperpolarizing factors and other compounds, and finally helps in blood vessel dilation. Therefore we can say that option c is the correct answer.