Adi, a 6-year-old girl, was running down the driveway, tripped and fell, scraping both of her knees. The left knee was bleeding profusely while the right knee, while scraped, was not bleeding. 1. Why was the left knee bleeding, but the right knee was not? (think layers of the integument) 2. Which knee may scar as a result of this injury?

Skin is considered to be the largest organ in the body of an organism. It is the outer layer that covers the entire body and protects the inner organs from microbes and infectious agents. Skin also plays a major role in the maintenance of the internal body temperature.

Skin is further divided into three integumentary layers, namely the epidermis, dermis and the hypodermis. The epidermis is the outermost layer and works as a barrier. The dermis consists of connective tissue and the hypodermis consists of connective tissue and fat molecules.