Quiz Flashcards
Epidermis
Top layer
Produces vitamin D
Barrier
Protects from environmental
Dermis
Contains blood and lymph vessels
Oils and sweat glands
Hair
Supplies epidermis
Hypodermis
Insulates and protects body and internal organs With fat cells
Why is vitamin d important
Helps bones absorb calcium
Connection between sunlight skin and D
Sunlight activates D found in skin to become the form needed in blood
What gives keratinocytes their name
Contain keratin, flexibility and toughness to skin
Describe keratinocytes life cycle
New are at bottom and old are at top
What is the function of the dead keratinocytes
Tough waterproof layer
What is function of melanocytes
They produce pigment melanin which gives color
How does melanocytes shape relate to its function
The long projections help deliver pigment to different places
When did ancestors become mostly hairless
Over 7 million years ago
Melanin is a what that’s produced in organelles called what in specialized cells called what
Pigment
Melanosomes
Melanocytes
2 primary melanin types
Pheomelanin: Redish yellow
Eumelanin: black and brown
