Question

1. local blood flow is also regulated when vasoactive chemicals are released from damaged tissue, inflammation, and platelets in response to tissue damage or as part of the bodys defense. this process is referred to as vasodilation. for example, histamine and bradykinin are released in response to a trauma, allergic reaction, infection, or even exercise. these chemicals may cause arterioles by directly stimulating nitric oxide or indirectly by stimulating endothelial cells of the vessel to release (click to select). this is a very powerful, but short - lived, vasodilator. other vasoactive substances, such as prostaglandin nes, can cause endothelin to help prevent blood loss through the damaged vessel.

Explanation:

Vasoactive chemicals from damaged tissue and platelets can cause either vasodilation or vasoconstriction. Histamine and bradykinin are associated with vasodilation by acting on arterioles and nitric - oxide release. Endothelin is involved in vasoconstriction to prevent blood loss. Erythrocytes and leukocytes are blood cells not directly related to this immediate vasoactive response in the context of the question.

Answer:

vasoconstriction