The Integumentary System Part 1 (6) Flashcards
What is your biggest organ? What does it do?
Your skin!
- Protects against extreme temperatures and infection
- Keeps your fluids balanced
- Makes Vitamin D from sunlight
- Helps you sense outside world
What 5 organs make up your INTEGUMENTARY SYSTEM?
- Hair follicles
- Sweat glands
- Oil glands
- Skin
BONUS: how do you pronounce “integumentary”?
in - TEG - you - MEN - tery
How many layers does your skin have?
- Epidermis
2. Dermis
What is the EPIDERMIS?
The thin, protective top layer of skin made of waterproof cells, melanin-making cells, germ-fighting cells, and nerve ending cells. It has FIVE LAYERS.
What is the DERMIS?
The middle skin layer that does most of the work, like pushing the epidermis into the shape of fingerprints, feeling things, supplying blood, and connecting to your body. It has THREE LAYERS.
AVASCULAR means…
“Without blood vessels.”
“Come, Let’s Get Sun Burned!” helps us remember what?
The five layers (stratum means “layer”) of the epidermis:
- Stratum CORNEUM
- Stratum LUCIDUM
- Stratum GRANULOSUM
- Stratum SPINOSUM
- Stratum BASALE
What are the dead, tough, waterproof skin cells called?
KERATINOCYTES (ku RAT inow sites)
What’s the Stratum CORNEUM?
The hard, waterproof outer layer of your epidermis, made of long-dead, super-tough keratinocytes.
What’s the Stratum LUCIDUM?
An extra layer of dead, see-through keratinocytes found only in your thick skin (palms and foot soles).
What’s the Stratum GRANULOSUM?
The grainy-looking skin layer just under your tough outer layers, made of living keratinocytes on their way up to the outer layers.
What’s the Stratum SPINOSUM?
The prickly-looking layer of newborn keratinocytes.
What’s the Stratum BASALE?
The bottom layer of epidermis, where the cells are made and sent on their way up through the other 4 layers.
True or false: the epidermis is AVASCULAR.
True!
True or false: the dermis is AVASCULAR.
False!
What are the 3 layers of the DERMIS?
- Papillary layer (ridged to help the epidermis above it have a grippy texture in fingers, etc.)
- Reticular layer (main layer with blood vessels and nerves)
- Hypodermis (fatty layer that connects everything to your organs)
What’s a MELANOCYTE?
Melanin-making cells in your epidermis!
What’s a LANGERHANS cell?
Germ-eating cells in your epidermis, sent there from your bone marrow!
What’s a MERKEL cell?
Cells connected to the nerve endings in your epidermis, to help you feel the outside world.
Your epidermis is either thick or thin skin based on what?
Whether it has an extra layer of dead, clear keratinocytes, called the stratum lucidum.
