Factoids
True or False:
Your hair and fingernails are elongated and/or flattened out dead skin cells.
False. They are both the same material – a matrix of fibers produced by follicle cells and pushed outward from the cell membrane.
True or False:
Nerve endings and blood vessels are densely packed into the epidermis
False. The epidermis doesn't sense much or bleed much.
Being exposed to the sun causes our skin to make _________________
Melanin
True or False
Formation of fingerprints occurs not in the integumentary system but underneath its innermost layer.
False. Melanocytes in the epidermis create fingerprint patterns.
True or False
Dust in your house is dead skin cells
True
What are the 2 types of glands?
Oil (Sebaceous)
Sweat (Eccrine)
The cells responsible for the pigmentation of our skin are called what?
Melanocytes
The three main patterns in fingerprints are called what?
1. Arch
2. Loop
3. Whorl
Fingernails are grown from which layer of the skin?
Epidermis
Which layer is responsible for detecting most sensations like heat/cold/sharpness/dullness?
Dermis
Melanin protects the tissues underlying the skin from what, specifically?
Ultraviolet radiation which causes DNA damage.
Some typical minor landmarks in a fingerprint that assist in matching individuals are (name TWO):
Bifurcation
Dot
Ridge ending
Delta
What are the 3 layers of the skin?
Epidermis, Dermis, Hypodermis (Subcutaneous)
If someone has very dry skin, what is the likely malfunction?
Oil secretions are not making a water-tight seal over the epidermal cells and cellular fluid is evaporating away.
Melanocytes
True or false: it is possible to eliminate fingerprints
True! Remove or damage the skin down to the dermis, and healing can obscure the pattern set during development.
What are the functions of the integumentary system? Name as many as you can.
Cool the body down
Warm the body up
Gather information about the environment
Keep out bacteria and viruses
What is the name of the tissue that cushions impact, stores energy, and provides thermal insulation?
How does sweat get out onto the surface of the skin from the sweat glands deep in the dermis?
through pores and extend upward from the dermis through the epidermis
How do fingerprints help criminal investigations?
A fingerprint found at a crime scene would need to match a database record of a suspect or a fresh sample from a suspect.