Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
31 Cards in this Set
- Front
- Back
|
What is the latin name for hair?
|
pili
|
|
|
What is a single hair and what is its composition and shape? How deep does it extend?
|
pilus, slender filament, composed of kertinized cells growing from a hair follicle that extends deep into the dermis, often projecting into the underlying subcutaneous layer.
|
|
|
What layer produces hair?
|
Epidermal layer.
|
|
|
What are the 3 recognizable zones along along the length of the hair?
|
Hair bulb, root, shaft
|
|
|
What does the hair bulb consist of?
|
Consists of epithelial cells and is a swelling at the base where the hair originates at the baseof the hair follicle.
|
|
|
What is at the base of the bulb?
|
A tiny cluster of dermal nerves and bv's that help the stratum basale cells of the hair bulb for the hair.
|
|
|
What is the remainder of the hair within the hair follicle?
|
Root, as the cells divide they are pushed upward, become keratinized, and die.
|
|
|
What portion of the hair extends beyond the skin surface?
|
The Shaft
|
|
|
What is the shaft composed of?
|
dead, keratinized cells
|
|
|
What is the hair follicle?
|
An oblique tube that surrounds the hair. It has an inner sheath of epithelial cells.
|
|
|
Where and what are the arrector pili muscles?
|
They extend from the conective tissue sheath around the hair follicle to the connective tissue of the dermal papillae. They are thin ribbons of SMOOTH muscle.
|
|
|
What happens when the arrector pili muscles contract?
|
They pull on the hair follicles, which elevates hairs and causes goose bumps.
|
|
|
What are the 6 functions of the hair?
|
Protection, heat retention, sensory reception, visual identification, chemical signal dispersal
|
|
|
How does the hair offer protection?
|
Helps cushion the head and protect the scalp, nose and ear hairs keep insects from entering, eyebrows and eyelashes protect the eyes.
|
|
|
What does it mean by the hair gives sensory perception?
|
Touch receptors are on the hair
|
|
|
What does it mean by hair can give chemical signal dispersal?
|
Help disperse pheromones that are detected by the vomeronasal organ in the human nose.
After pheromones are secreted by selected sweat glands, such as those in the axillary and pubic regions, they are released onto hairs in these areas for dispersal into the air. |
|
|
What determines hair color?
|
Type and amount of pigment produced in the stratum basale cells at the base of the hair follicle
|
|
|
What type of hair color would a person with more melanin have?
|
darker hair color...black or brown
|
|
|
What is responsible for red hair?
|
an iron-based pigment
|
|
|
What is responsible for gray hair?
|
Results from the gradual reduction of melanin production within the hair follicle.
|
|
|
what color of hair would you have if you lacked pigment entirely?
|
White hair
|
|
|
are all hair follicles active?
|
No, some may grow hairs for year and then become dormant for months before tehy start up again and push the older hair out.
|
|
|
What can cause hair loss?
|
dietary deficiencies, high fever, radiation, drugs, aging, genetics, or because of changes in hormonal levels.
|
|
|
Where do all of the glands in the skin originate in and where are they located?
|
Epidermal layer, and they are located in the dermis
|
|
|
What type of glands secrete substances through ducts?
|
Exocrine glands
|
|
|
What are the 2 types of exocrine glands?
|
Sweat/suderiferous glands and
sebaceous glands |
|
|
What do the sweat glands secrete? What does it help do?
|
Perspiration onto the surface of the skin. It helps regulate body temp or to aid in signaling and communication i.e. -pheremones)
|
|
|
What type of glands help in the elimination of body materials such as excess water, sweat, and urea?
|
Sweat glands
|
|
|
What are the 2 characteristics of sweat glands?
|
Sweat glands/sebacious glands help 1. in the elimination of body materials (excess H20, salts, and urea) 2.Produce inhibitory chemicals that can prevent the growth of many dangerous microorganisms.
|
|
|
What type of glands are found within the breasts of both men and women
|
Mammary glands which are specialized sudoriferous (sweat) glands
|
|
|
What do mammary glands secrete?
|
Milk during lactation
|
