Skin Structure
This epidermal layer contains keratohyalin granules and is where waterproofing lipids are released.
What is the stratum granulosum?
The antimicrobial barrier on the skin surface created by sweat and sebum.
What is the acid mantle?
The four major tissue types in the human body.
What are epithelial, connective, nervous, and muscular tissue?
The sugar component of DNA nucleotides.
What is deoxyribose?
The RNA type that carries genetic instructions from DNA to ribosomes.
What is messenger RNA (mRNA)?
This epidermal layer exists only in thick skin such as the palms and soles and contains the protein eleidin.
What is the stratum lucidum?
The peptide molecules in skin secretions that help kill bacteria and fungi.
What are dermcidin and defensins?
The extracellular material composed of fibrous proteins and ground substance that surrounds cells in many tissues.
What is the matrix?
The nitrogenous bases that contain two rings.
What are purines (adenine and guanine)?
The RNA type that forms part of the ribosome structure.
What is ribosomal RNA (rRNA)?
The deepest epidermal layer containing stem cells, melanocytes, and tactile cells.
What is the stratum basale?
The process by which skin begins vitamin D production before the liver and kidneys complete it.
What is vitamin D synthesis in the skin?
The technique in histology where tissue is sliced into sections only one or two cells thick.
What is histological sectioning?
The two bases that form three hydrogen bonds in DNA.
What are cytosine and guanine?
The RNA type responsible for bringing amino acids during protein synthesis.
What is transfer RNA (tRNA)?
The upward projections of the dermis that create the wavy boundary between dermis and epidermis.
What are dermal papillae?
A tissue slice cut perpendicular to the long axis of an organ.
What is a cross section (transverse section)?
The rule stating that base sequences on one DNA strand determine those on the other.
What is the law of complementary base pairing?
These downward folds of epidermis interlock with dermal papillae to increase surface area and attachment strength.
What are epidermal ridges?
The technique used when tissue is rubbed across a slide, commonly used for blood.
What is a smear preparation?