Exam 3 - Weeks 5, 6, 7 (Bios 251) Test Questions And Answers.

functions of integumentary system - Answer protection, sensation, temperature regulation, vitamin d production, excretion components of integumentary system - Answer skin, hair, nails, sweat glands, oil glands, mammary glands Epidermis - Answer the outer layer of the skin covering the exterior body surface of vertebrates Dermis - Answer the middle layer of the skin, which contains most of the skin's structures Hypodermis - Answer Aso called a subcutaneous layer, this is a layer of *fat located under the dermis of the skin. The hypodermis helps to insulate the body and protects underlying muscles and other structures. Layers of thick skin from deep to superficial - Answer stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum layers of thin skin deep to superficial - Answer stratum basale, stratum spinosum, stratum granulosum, stratum corneum cell types of epidermis - Answer keratinocytes, melanocytes, merkel cells, langerhans cells fibers in dermis - Answer collagen, elastic, reticular Melanin - Answer A pigment that gives the skin and hair its color eumelanin and pheomelanin - Answer Hair color is influenced by the amount, size and distribution of: eumelanin = brown or black hair, phomelanin = red hair Phases of hair growth - Answer anagen, catagen, telogen Anagen - Answer The period of active hair growth . 6-8 years, stem cellsmultiply, hair lengthens. After 40's,hair spends more time in otherstages