Bio 223 Chapter 5: Integumentary System (CSN)

Select the regions that are composed of loose connective tissue

Subcutaneous tissue or hypodermis Papillary layer of dermis

The epidermis is composed of ____________ tissue.

epithelial

The stratum lucidum:

appears transparent has dispersed keratohyalin around keratin fibers

The highest rate of cell division in the epidermis occurs within the stratum

basale

The tympanic membrane is protected from the entry of dirt and small insects into the ear canal by the presence of ____________ and ___________.

cerumen and hairs

The dermis is primarily composed of ____________.

connective

Merkel cell

detect touch and pressure

Put the steps of vitamin D in order

1. The skin is exposed to UV light 2. The precursor molecule, 7-dehydrocholesterol, is converted into cholecalciferol 3. OH ions are added to cholecalciferol 4. Active vitamin D (calciferol) is formed

Identify the components of the integumentary system

Nail Skin Cutaneous glands Hair

Identify the functions of the integumentary system.

Sensation of environment stimuli Resistance of infection Thermoregulation

Identify the properties that help the skin prevent microorganisms and other foreign substances from entering the body.

The lack of blood vessels in the epidermis limits access to central circulation Multiple layers of dead cells make it difficult for pathogens to enter Secretions from skin glands produce an environment unsuitable for some microorganisms

The primary determinant for skin color is the ____________, not the ____________.

amount of melanin; number of melanocytes

The sweat glands are considered ____________ skin.

accessory

The functions of the epidermis include all the folowing EXCEPT:

insulation and temperature storage

Langerhans cell

immune cells

the multiple layers of the skin

inhibition of microorganisms entry

Melanocyte

promote skin color

Melanocytes

protect skin from UV radiation

Keratinocyte

reduce water loss

Skin features that help the body from microorganisms include:

secretions of the sebaceous glands presence of components of the immune system stratified epithelial tissue

Merkel cells

sensing external stimuli

Collagen and elastin fibers

structural strength and flexibility of the skin

Blood vessels of papillary layer

temperature regulation