Hair and Infections + Allergies Flashcards
What is the fastest-growing tissue in the body?
Hair
List 2 protective functions of hair. (2)
- Eyelashes shield the eyes
2. Nose hairs keep foreign particles out of the respiratory tract
What substance is the reason for the development of hairy regions?
Hormones
Is the epithelial structure of hair stiff or flexible?
Flexible
Define: matrix
Matrix: growth zone of the hair bulb at the deep end of the follicle
Define: medulla
Medulla: central core consisting of large cells and air spaces
What is hair mainly composed of?
The bulk of the hair shaft is dead material made almost entirely of protein
Define: athlete’s foot
Athlete’s foot: itchy, red, peeling condition between toes, resulting from an infection with the fungus tinea pedis
What are boils (furuncles) and carbuncles caused by?
Boils (furuncles) and carbuncles → caused by inflammation of hair follicles and surrounding tissues
Define: cold sores (fever blisters)
Small, fluid-filled sacs or blisters. caused by a human herpes virus 1 infection, that itch and sting
What are the usually dormant cold sores activated by? (3)
- Emotional upset
- Fever
- UV radiation
Where do cold sores usually appear?
Around the mouth and nose
Where do cold sores sit dormant usually?
In a cutaneous nerve
Define: impetigo
Staph infection characterized by pink, fluid-filled lesions that develop a yellow crust and eventually rupture
Define: psoriasis
Autoimmune condition characterized by reddened epidermal lesions covered by dry, silvery scales that itch, burn, and crack
