Chapter 5 a&p

Melanocytes and keratinocytes work together in protecting the skin from UV damage when keratinocytes ________.

accumulate the melanin granules on their superficial portion, forming a UV blocking pigament layer.

dendritic cells

activate the immune system

Appearance of a permanent tan; bronzing.

addison's disease

a bluish color in light-skinned individuals

cyanosis

Skin macrophages that help activate the immune system

dendritic cells

May indicate embarrassment, fever, hypertension, inflammation, or allergy.

erythema

Water loss through the epidermis could cause a serious threat to health and well-being. Which of the following protects us against excessive water loss through the skin?

glycolipids that are secreted by keratinocytes into extracellular spaces

usually indicated a liver disorder

jaundice

the fibrous protein that helps give the epidermis its protective properties

keratin

The most abundant cells of the epidermis.

keratinocytes

Spider shaped epithelial cells that synthesize the pigment melanin

melanocyte

Cells plus a disc-like sensory nerve ending that functions as a sensory receptor for touch.

merkel cells

may indicate fear, anemia, or low blood pressure

pallor

The layer that contains the mitotic viable cells of the epidermis

stratum basale

The layer of the epidermis where the cells are considered protective but nonviable

stratum corneum

the layer of the epidermis that contains one to five layers of flattened cells and deteriorating organelles

stratum granulosum

layer of the epidermis that is several layers thick and contains pre-keratin

stratum spinosum

Despite its apparent durability, the dermis is subject to tearing. How might a person know that the dermis has been stretched and/or torn?

the appearance of visible, silvery-white scars is an indication of stretching the dermis

the reason why the hypodermis acts as a shock absorber is that

the major part of its makeup is adipose, which serves as an effective shock absorber

a splinter penetrated into the skin of the sole of the foot, almost to the papillary region of the dermis. which layer of the dermis would be the final layer injured?

basale