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Question 46 3 pts Which of the following are chemical mediators? O mast cells O macrophages histamines Question 47 3 pts Whic
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46. Histamines

Histamines come under the category of chemical mediators. Histamines are responsible for arteriolar dilation, increased permeability of capillaries and contraction of nonvascular smooth muscles.

47. a. blood

Lymph nodes do not contain blood.

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