Chapter 4 Flashcards
Glandular Tissue, Membranes
One or more cells that makes and secretes an aqueous fluid called secretion
Unicellular or multicellular
Gland
Internally secreting to the bloodstream
Lose their ducts during development, secrete hormones into the interstitial fluid
Target organs respond in characteristic way
Endocrine gland
Externally secreting
Ex. Sweat
Retain to the connecting cells, forms duct to transport secretions to epithelial surface
Exocrine gland
Process by which endocrine glands secrete hormones
Exocytosis
Single celled
Found in epithelial linings of intestinal and respiratory tract
Produce mucin
Ex. Mucous cells and goblet cells
Unicellular exocrine glands
Sugar-protein that can dissolve in water to form mucus
Formed by unicellular exocrine glands
“Snail ____”
Mucin
Composed of duct and secretory unit
Usually surrounded by supportive connective tissue that supplies blood and nerve fibers to gland
Classified by structure and mode of secretion (Tubular, alveolar, etc.)
Multicellular exocrine glands
Unbranched exocrine ducts
Simple multicellular gland
Branched exocrine ducts
Compound multicellular gland
Secretory cells form duct
Tubular multicellular gland
Secretory cells form sacs in gland
“Lungs have alveoli sacs”
Alveolar multicellular gland
Secretory cells have both ducts and sacs
Tubuloalveolar multicellular gland
Secrete products by exocytosis as secretion are produced (sweat, pancreas)
Merocrine exocrine gland
Accumulate products within, then rupture (sebaceous oil glands)
“holy cow it ruptured”
Holocrine exocrine gland
Accumulate products within, but only apex (tip) ruptures
Apocrine exocrine gland
Cutaneous membranes
Mucous membranes
Serous membranes
Three types of covering linings:
Another name for skin
Unlike other membranes, skin is dry
Cutaneous membranes
Mucosa indicates location (not cell composition)
Moist membranes bathed by secretions or urine
Epithelial sheet lies over layer of loose connective tissue called lamina propria
Also called mucosae
Mucous membranes
Lines body cavities that are open to exterior (Digestive, respiratory, urogenital)
A.k.a mucosae
Mucous membranes
Found in ventral body cavities
Constructed from simple squamous epithelium resting on thin areolar connective tissue
Visceral, parietal, and serous fluid
Serous membranes
Lines internal body cavity walls
Parietal serosae
Covers internal organs
Visceral serosae
Same kind of tissue replaces destroyed tissue
Regeneration
Connective tissue replaces destroyed tissue, original function lost
Fibrosis
- Inflammation
- Organization restores blood supply
- Regeneration and fibrosis effect permanent repair
Order of Tissue Repair
Epithelial tissue, bone, areolar connective tissue, dense irregular connective tissue, blood tissue
Tissues that regenerate well:
Smooth muscle and dense regular connective tissue
Tissues that regeneration moderately:
Cardiac muscle, nervous tissue (brain and spinal cord)
No functional regenerative ability:
Forms in organs and can severely impair function by hardening of tissue
May cause organ to lose volume capacity
May interfere with ability of muscles to contract or may impair nerve transmissions
Scar tissue