Chapter_05_Integumentary.ppt.pptx - Anatomy and Physiology I BIOL 2401 Chapter 5 Integumentary System Chapter 5 Integumentary System Learning objectives

Chapter_05_Integumentary.ppt.pptx - Anatomy and Physiology...

This preview shows page 1 - 10 out of 31 pages.

BIOL 2401 Anatomy and Physiology I Chapter 5 Integumentary System
Image of page 1

Subscribe to view the full document.

Chapter 5 Integumentary System Learning objectives: Describe the functions of the skin. Describe the two layers of the skin, their structure and role in maintaining homeostasis. Differentiate between thin and thick skin. Describe the factors that contribute to skin colors. Describe the structure and function of hair and hair follicle. Describe the structure and functions of exocrine glands associated with the skin. Describe the structure and function of nails. Explain the repair process for superficial and deep skin injuries. Describe the changes associated with aging of the skin.
Image of page 2
Skin Accessory structures glands, hair, nails, sensory receptors Integumentary system:
Image of page 3

Subscribe to view the full document.

Functions of the Skin Protection Stratified epidermis…protects from abrasions Sweat and sebum…protects from bacterial infections Keratin…water proofing Melanin…protects from UV WBC in dermis…immunity Temperature regulation Sweat…evaporates to cause cooling Blood vessels…vasoconstriction/vasodilation to regulate heat loss from warm blood in the skin Arrector pili…goose bumps Sensation Nerves to sense touch, temperature and injury (pain) Excretion Sweat…salts, lactic acid, urea Synthesis of vitamin D For absorption of calcium
Image of page 4
Skin Two parts/layers: Epidermis Dermis *Subcutaneous layer attaches the skin to underlying muscles
Image of page 5

Subscribe to view the full document.

Skin - Epidermis Stratified squamous epithelium Composed of 4-5 layers: Stratum corneum Stratum lucidum Stratum granulosum Stratum spinosum Stratum basale
Image of page 6
Skin Epidermis Stratum corneum : Top layer with flat, dead cells Packed with keratin Continuously shed as dander Stratum lucidum : Dead keratinocytes Present only in thick skin (palm, sole) Stratum granulosum : Keratinocytes making keratin Degenerating nucleus…dying cells Stratum spinosum : Live, non-dividing keratinocytes Phagocytize melanin from melanocytes present in S basale Stratum basale : Deepest layer Actively dividing cuboidal cells Produce new cells that are pushed upwards to become keratinocytes of S spinosum Have melanocytes (make melanin) and Merkel cells (touch sensation)
Image of page 7

Subscribe to view the full document.

Thick vs. Thin Skin Thin Skin Skin is thin and smooth Most regions of the body Epidermis has four layers: S corneum S granulosum S spinosum S basale S corneum is thinner Sebaceous glands are present Fewer sudoriferous glands Fewer sensory receptors Thick Skin Skin is thicker and rougher Specific regions – palm and sole Epidermis has five layers: S corneum S lucidum S granulosum S spinosum S basale S corneum is thicker Seceous glands are absent More sudoriferous glands More sensory receptors Mostly refers to differences in epidermis of the skin
Image of page 8
Skin - Dermis Connective tissue layer collagen & elastic fibers
Image of page 9

Subscribe to view the full document.

Image of page 10
  • Fall '19

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes