3 Histology and Integumentary System Flashcards
Four types of tissue and their purpose
Connective (connect), Muscle (contract), Epithelial (cover), Nervous (conduct)
Epithelia tissue is derived from
Ectoderm, mesoderm, and endoderm
Connective Tissue derived from
Mesoderm
Muscle tissue is derived from
Mesoderm
Nervous tissue is derived from
Ectoderm
Cellularity
minimal amounts of extracellular fluid
Polarity
defined apical (free or top surface) and basal (fixed or bottom surface) layers
Attachment
Basal layer bound to basement membrane
Avascularity
no blood vessels, gets nutrients from underlying connective tissue,
Innervation
Contains nerve endings
Regeneration
Cells replaced at high rate via mitosis
Tight Junctions
continuous sealed plasma membranes near apical surface
Adhering Junctions
Typically located deep to tight junctions
Desmosomes
Provide resistance at a single stress point
Gap Junctions
Direct passageways for small molecules to travel between cells
where is Cilia found?
respiratory and reproductive systems
Microvilli is for
increasing surface area of a cell, kidney tubules and small intestine.
function and locations of Simple Squamous Epithelium
diffusion and filtration, in the lung sacks (alveoli), lining of blood vessels, serous membranes.
Transitional Epithelium functions
Distention and relaxation of urinary structures
Exocrine glands
ducts that secrete material onto an epithelial surface
Endocrine glands
ductless, cells secrete products into interstitial fluid and bloodstream
What does and what is the merocrine glands?
Exocrine gland that secretes via vesicles, lacrimal, salivary, gastric, pancreatic and eccrine sweat glands.
Holocrine Glands
Exocrine gland, entire cell disintegrates
Apocrine Glands
Secrete by decapitation, mammary and apocrine seat glands
3 Types of Mesenchyme Connective Tissue
Embryonic origin: Connective tissue proper, supporting connective tissue, and fluid connective tissue.
What is included in the Integument
Epidermis, epithelial tissue and avascular, Dermis, connective tissue and vascular. (Not the hypodermis)
Layers of epidermis
Can Loud Girls Sing Bass, Corneum, Lucidum, Granulosum, Spinosum, Basale. Lucidum is only a part of thick skin regions.
Keratinocytes
produces keratin, found in all layers, most abundant.
Epidermal Dendritic Cells (Langerhans Cells)
macrophages, immune response, found in spinosum
Tactile Cells are also called?
Merkel Cells sensory receptors found in basale layer
Melanocytes
produce melanin, basale
mole or birth marks are caused by what?
Over growth of melanin-forming cells.
