Exam 2 Slide Show Integumentary (pt3) Flashcards
Pacinian corpuscles are located where?
Subcutaneous layer
What do pacinan corpuscles sense?
pressure
What are commonly known as finger prints?
Epidermal ridges
When do epidermal ridges develop?
During the third and fourth fetal months.
Epidermal ridges increase the grip by increasing what?
Friction
What are the sweat pores of the epidermal ridges used for?
Better gripe by hydrogen bonding.
The combination of what three pigments, is responsible for the color of skin?
- Melanin
- Carotene
- Hemoglobin
How are the amounts and expression of melanin and carotene determined?
Genetically
Is the amount of hemoglobin genetically determined?
No
What causes the color of skin to vary from pale yellow to tan to black?
The amount of melanin
Differences in skin color among different races are mainly due to what?
the amount of pigment the melanocytes produce and distribute
Does one race have more melanocytes than another?
No. The number of melanocytes is about the same in all races
What increases the enzymatic activity of melanosomes, leading to increased melanin production?
Exposure to UV light
What is a yellow-orange pigment that is a precursor to vitamin A, which is used to synthesize pigments needed for vision?
Carotene
Where is carotene found?
in the stratum corneum and fatty areas of the dermis and subcutaneous layer
What is the oxygen carrying pigment in red blood cells?
Hemoglobin
What generally causes the skin to appear pink?
When little melanin or carotene are present causing the hemoglobin to be expressed.
What causes blood to have a reddish color?
The iron in the hemoglobin
Where are sebaceous glands located?
In the dermis
What do sebaceous glands secrete?
Sebum (oil) into a hair follicle
Where are sweat glands found?
The dermis
What is the superficial portion of the hair?
The shaft
What three layers comprise the shaft and root of the hair?
The medulla, cortex, and cuticle
What is the hair composed of?
Dead, keratinized cells bonded by proteins
Where is the root of the hair located?
The dermis
