BIO 190 - Unit 2 Flashcards
What are the functions of the integumentary system?
- excrete
- protect
- thermoregulate
- sense organ
- synthesizes vitamin d
Why are melanomas a particularly dangerous type of skin cancer?
Because of their cytoplasmic projections.
What accounts for the variety of skin and hair color in humans?
melanin
Can hair, skin, or nails absorb vitamins and nutrients like the ads claim?
No.
epidermis
- avascular
(Cancer Loves Good Sun Burns)
- stratum corneum
- stratum lucidum
- stratum granulosum
- stratum spinosum
- stratum basale / germinativum
melanocyte
- protects from UV radiation
- located in stratum basale / germinativum
keratinocyte
produces keratin
Langerhans cell
phagocytic cells, immune system
Merkel cell
fine touch receptors in areas without hair
melanin
black pigment, the darker you are, the more melanin granules you have
dermis
- vascular
- gives structure
- first layer: papillary layer (Meissener’s corpuscles, dermal papillae)
- second layer: reticular layer (Pacinian corpuscles)
Pacinian corpuscle
- vibration, pressure
- vascular, glandular, extremely elastic
hypodermis / subcutaneous layer
- not technically a part of the skin
- adipose, connective, and vascular tissue
sebaceous gland
- holocrine (explodes), secrete sebum (keeps hair soft, pliable, and waterproof) into hair follicle
eccrine gland
- excretion, protection, thermoregulation, preserves skin’s mantle
- responds to temp and exercise
- mostly excretes water and salts
- everywhere except ear canal, lips, and genitals
