1. Mary, 21 years old, presented to the hospital emergency department with an infected laceration on her left foot. Mary was at a beach resort four days ago, when she trod on a broken glass bottle and sustained a deep 2 cm long jagged laceration over the lateral aspect of her left foot. She used her handkerchief to bandage the wound. This morning the wound was extremely painful, swollen and had a purulent discharge.
2. On inspection of the wound the following wound observations were made:
3. – Painful and swollen,
4. – Red and warm when touched. – Purulent discharge.

what is the Physiological basis of the wound observations