Chapter 5 Flashcards
Cells are organized into _
Tissues
Define tissue
Groups of similar cells with a common function
Name the 4 major types of tissues
Epithelial
Connective
Muscle
Nervous
Name the three types of intercellular junctions
Tight Junction
Desmosomes
Gap
Explain tight junctions (intercellular junction)
- Membrane between cells mere and fuse together
- Blood brain barrier
- Forms linings and sheetlike layers
Explain desmosomes (intercellular junction)
- Form spot welds between cells
- Structural reinforcement
- Outer skin cells
Explain gap (intercellular junction)
- Tubular channels between cells
- Molecules can move between cells
- Cardiac muscle and intercalated disks
Epithelial Tissues
- Covers organs and body surfaces
- Lines cavities and hollow organs
- Make up glands
- Lack blood vessels
- Injuries heal rapidly
- Classified according to shape and function
Epithelial Shapes
- Squamous: flat
- Cuboidal- cube shape
- Columnar- tall
Epithelial layers
- Simple- one layer
- Stratified- 2 or more layers
- Pseudostratified- not actually a layer, but looks like one
Simple Squamous (epithelial)
- Filteration, diffusion, osmosis
- Covers surface
- Lines air sacs, and capillaries
- Lines blood and lymphatic vessels
Simple Cuboidal (epithelial)
- Secretion, absorption, protection
- Surface of ovaries
- Linings of kidney tubules
Simple Columnar (epithelial)
- Section, absorption, protection
- Lining of uterus
- Lining of stomach
- Lining of intestines
Pseudostratified columnar (epithelial)
- Protection
- Linings of respiration passages
Stratified squamous (epithelial)
- Protection
- Skin
- Linings of oral cavities
Stratified cuboidal (epithelial)
- Protection
- Linings of mammary glands
- Sweat glands
- Salivary glands
- Pancreas
Stratified columnar (epithelial)
- Protection, secretion
- Part of male uretha
- Linings of larger ducks of glands
Transitional (epithelial)
- Protection
- Linings of urinary bladder
- Ureters
- Part of uretha
Glandular (epithelial)
- Produce and secrete substances into ducts or body fluids
- Endocrine: Into tissue fluid or blood (pancreas)
- Exocrine: into ducts that open
Merocrine gland (glandular secretion)
Secrete fluid products by exocytosis, salivary and sweat glands, pancreas
Apocrine gland (glandular secretion)
Lose small part of cell during secretion
- Mammary
- Axillary
- Genital
Holocrine gland (glandular secretion)
Release entire cells filled with product
-Hair follicles that is why our hair is soft
