HSCI 100 Lecture Notes - Lecture 6: Basal-Cell Carcinoma, Integumentary System, Skin Cancer
30 Oct 2016
School
Department
Course
Professor
Document Summary
An organ is 2+ tissue types working towards a particular function. An organ system is a combination of organs that work together to carry out a particular function. Includes the skin and accessory organs such as hair, nails, and glands. The skin has two main regions called the epidermis and dermis. Under the skin there is subcutaneous layer between the dermis and internal structure where fat is stored. Protects the body from physical trauma, invasion of pathogens and water loss. Allows us to be aware of our surroundings through sensory receptors. Synthesizes chemicals such as melanin and vitamin d. The thin, outermost layer of the skin. Cells in the uppermost cells are dead and become filled with keratin thus acting as a waterproof barrier. Langerhans cells are a type of white blood cell (macrophage) that help fight pathogens. Melanocytes produce melanin that lead to skin color and protection for uv light. Some cells convert cholesterol to vitamin d.
