skin Flashcards
(23 cards)
What is the largest organ of the human body?
The skin
The skin is associated with touch.
Name the three layers of the skin.
- The Epidermis
- The Dermis
- The Hypodermis
What are the two structures found in the epidermis?
- The Dead Layer
- The Living Layer
What is the function of keratinocytes in the epidermis?
They produce keratin, providing strength and protection against wear and germs.
What do melanocytes synthesize?
Melanin
How long does it take for the epidermis to renew on average?
60 days
What are the five structures that compose the dermis?
- Sensory Receptors
- Blood Vessels
- Sebaceous Glands
- Sweat Glands
- Hair
What is the role of sebaceous glands in the skin?
They produce sebum, an oil that waterproofs the skin.
What do sweat glands produce?
Sweat
What is the primary composition of the hypodermis?
Fat Cells
What sensations can the sensory receptors of the skin perceive?
- Tactile sensations (pressure and touch)
- Thermal sensations (heat, cold)
- Painful sensations (pain)
True or False: Sensory receptors are evenly distributed throughout the body.
False
What is one of the important functions of the skin?
Protection against bacteria
What does sebum do for the skin?
Makes the skin impermeable
What is the second role of the skin?
Regulation of body temperature
What happens to dermal blood vessels when it is hot?
They dilate
Approximately how much sweat is produced per day at room temperature?
200 mL
What can happen in extreme heat regarding sweat production?
Up to 1L of sweat can be lost in one hour
What occurs to capillaries in the dermis when it is very cold?
They constrict
What does the hypodermis do for the body?
Acts as a thermal insulator
What is one function of the skin related to internal organs?
Protects internal organs
What role does the skin play in vitamin D production?
It is an excretory organ that helps produce vitamin D.
What stimulates the production of vitamin D3 in the epidermis?
Solar ultraviolet-B radiation (UVB)
