What protein allows stretching and recoiling of the skin?
2.11. Elastin is a vital protein component of the ECM present in many mammalian tissues, which require elasticity as part of their function,59 including vasculature, skin and lungs. Mature elastin is an insoluble polymer composed of several tropoelastin molecules covalently bound to each other by cross-links.
What are the two types of fibers in skin that allow stretching of the skin?
Two types of fibers in the dermis — collagen and elastin — help skin stretch and stay firm.
Which protein that reduces water loss at the skin surface?
keratin
It thickness varies: 0.07-0.12 mm over most of the body to 0.8 mm on the palms and 1.4 mm on the soles. Its surface layer, consisting of dead cells, is rich in keratin, a protein which renders it dry and more or less waterproof, thus resisting surface evaporation and preventing excessive water loss.
What is the name of the layer of hard keratin that coats the hair?
The medulla forms the central core of the hair, which is surrounded by the cortex, a layer of compressed, keratinized cells that is covered by an outer layer of very hard, keratinized cells known as the cuticle.
What allows elastin stretch and recoil?
One-third of the amino acids in elastin are glycine. Glycine is distributed randomly throughout the elastin molecule and this random distribution makes elastin hydrophobic. This hydrophobic quality allows elastin molecules to slide over one another, or stretch, to maintain structural integrity and provide recoil.
What protein fiber that is found in the dermis gives skin its flexibility and firmness?
161 Cards in this Set
| Coiled structures attached to hair follicles found in the underarm and genital areas that secrete sweat | Apocrine glands |
|---|---|
| What protein fiber is found in the dermis and gives skin its flexibility and firmness? | elastin |
| What hormone stimulates cells to reproduce and heal? | Epidermal growth factor (EGF) |
What are the two proteins that make up elastic fibers?
Elastic fibers are composed of two components, one made up primarily of elastin protein and the second being a complex of proteins, rich in fibrillins, that form microfibrils (Wagenseil and Mecham, 2007).
What produces protein in the skin?
Collagen is the most abundant structural protein in the connective tissues of the human body and makes up more than 75 percent of our skin. Collagen is produced by fibroblasts which are specialized cells that help create the structural framework of human and animal tissues and aid in wound healing.
What is the most common protein in the epidermis?
Collagen
Collagen is the most abundant protein in the skin. It makes up 75% of your skin. This is also your “fountain of youth,” responsible for warding off wrinkles and fine lines. Over time, environmental factors and aging diminish your body’s ability to produce collagen.
Which layer contains most of the epidermal derivatives?
Epidermal derivatives (also called epidermal appendages) develop from the epidermis, but are located within the dermis. The most obvious epidermal derivatives are hair follicles, which produce hair on most body surfaces.
What is elastic protein?
The term ‘elastic protein’ applies to many structural proteins with diverse functions and mechanical properties so there is room for confusion about its meaning. Elastic implies the property of elasticity, or the ability to deform reversibly without loss of energy; so elastic proteins should have high resilience.