The Integumentary System

Metabolism

________- and other useful chemicals are manufactured by the skin vitaminD.

Excretion

________- and glands secretions help dump wastesweat oil products outside of the body 4.

Melanocytes

________ (8 %)- produce the pigment which gives skinmelanin its color and protects skin from UV damage 3.

Terminal

________ are very fine body hairs found on children and females vellus are thicker, often darker hairs that make up eyebrows, eyelashes, scalp hair and mody body hair in men after puberty HAIR STRUCTURE (Fig.

tough fibrous

Technically the epidermis is classified as A key feature is- a(n) ________ found throughout the keratin proteinepidermis (it is the primary protein in skin, nails and hair, and claws, horns, fur, feathers, and scales by the way)

papillary layer forms

The ________ bumps (papilla) in the epidermis that create ridges (source of fingerprints)

Temperature regulation

________- helping maintain normal body temperature.

glands

Both ________ and hair are epidermal in origin but are located deep in the dermis.

Thick skin

________ has 5 layers Thin skin has 4 layers From deep to superficial (See Figure 5.2) Stratumbasale.

Protection

________- Langerhans cells initiate an immune response if skin isimmune breached, mobile cells (like macrophages) are present to help 2.

plenty of space

It is made up of connective tissue, which provides ________ for papillarylayer wandering 100Immune cells.

Systems

________ consist of a variety of and working together towards a common goal or tissues function.

thick layer of tough

It consists of a(n) ________ connective tissue.

Protection

________- it is an effective barrier in several ways, including: barrier- keratin, lipids, melanin, antibacterial agents etc.

Handout for Chapter 5 (The Integumentary System) KEY FIGURES IN THIS CHAPTER

5.1, 5.2, 5.3 We now start covering chapters by system

organs PARTS OF THE INTEGUMENTARY SYSTEM skin (largest organ in the body) made up of two layers epidermis(epithelial tissue) and (connective tissue)dermis (sometimes called the subcutaneous layer) hypodermis A variety of structures like hair, nails and glands derivative Muscles, nerves, blood vessels are also found within this system SKIN

AN ORGAN There are two types of skin covering our bodies (4-6 mm thick) found on the soles, palms and fingertips (areas of thickskin the body subject to heavy abrasion) contains 5 epidermal layers

EPIDERMIS

THE TOP LAYER OF SKIN (Fig

There are four types of cells that make up the epidermis 1. keratinocytes (90%)

produce the protein keratin 2

Melanocytes (8%)

produce the pigment which gives skinmelanin its color and protects skin from UV damage 3

(1%)

aid in activation of an immune responseLangerhans

protection

Langerhans cells initiate an immune response if skin isimmune breached, mobile cells (like macrophages) are present to help 2

Temperature regulation

helping maintain normal body temperature

Excretion

and glands secretions help dump wastesweat oil products outside of the body 4

Metabolism

and other useful chemicals are manufactured by the skin vitaminD

Sensation

sensations that arise from the skin (e.g