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Why the redness can be seen during inflammation?

(a) Local blood vessel dilation

(b) Influx of plasma proteins, phagocytic cells into the tissue spaces

(c) Release of enzymes

(d) Increased of tissue pressure

The question was posed to me in examination.

My question is taken from Drug Addiction and Abuse topic in chapter Local & General Anesthetics, Opioid Analgesics, Drug Addiction and Drug Abuse of Drug Biotechnology

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Correct option is (a) Local blood vessel dilation

The best I can explain: The redness and heat is due to the local blood vessel dilation. The swelling is due to the influx of plasma proteins and phagocytic cells into the tissue spaces. And the pain is due to the local release of enzymes and increased tissue pressure. These are the four signs of inflammation which can be seen in a human body.

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