Lesson 6 Flashcards
connective tissue
most abundant, widely distributed, and variable type of tissue in which cells occupy less space than the matrix
three basic characteristics of connective tissues
- specialized cells - more than one cell type in each tissue
- solid extracellular protein fibers found outside cells
- fluid extracellular ground substance - fills space between cells, usually gelatinous; can slow down movement of pathogens infecting the tissue
matrix
the extracellular components of the connective tissue
functions of connective tissues (8)
- movement - bones
- storage - fat, calcium
- heat production
- transport
- immune protection
- physical protection
- support
- binding of organs
meenchyme
- first connective tissue in embryos
- not found in adults, but may adult connective tissues do have mesenchymal stem cells that can undergo differentiation
Wharton’s jelly - mucous connective tissue
- not found in adults
- loose connective tissue found in many parts of the embryo, including umbilical cord
three general categories o connective tissue
- connective tissue proper
- fluid connective tissues
- supporting connective tissue
connective tissue proper - fibrous connective tissue - fibroblasts
produce fibers and ground substance of matrix
connective tissue proper - fibrous connective tissue - macrophages
arise from monocytes; phagocytize foreign material and activate immune system when needed
connective tissue proper - fibrous connective tissue - leukocytes
white blood cells function in immune defense
connective tissue proper - fibrous connective tissue - plasma cells
arise from lymphocytes and synthesize antibodies
connective tissue proper - fibrous connective tissue - mast cells
secrete heparin to inhibit clottings and histamine to dilate blood vessels
connective tissue proper - fibrous connective tissue - adipocytes
clustered in some fibrous tissues; where they dominate is called adipose tissue
functions of the layers of connective tissue proper (3)
- provide routes for blood/lymphatic vessels and nerves
- provide strength and stability
- maintain the position of internal organs
fasciae
body’s framework of connective tissue that warp, support, or surround organs
fasciae - superficial fascia/hypodermis
provides insulation and padding under the integumentary system (skin)
fasciae - deep fascia
resists multidirectional force; wraps organs in capsules, found at the end of muscles as tendons to link bones to ligaments
fasciae - subserous fascia
protects body cavity lining when muscles/muscular organs move
adipose tissue
tissue in which adipocytes are the dominate cell type
space between adipocytes is occupied by _____, _____, and _____.
areolar tissue, reticular tissue, and blood capillaries
how are adipocytes produced?
by mitosis of mesenchymal cells around adipose tissue, NOT mitosis of adipocytes
white adipose tissue (white fat)
the most abundant and significant type of adipose tissue in adults
white adipose tissue - functions (4)
- provides thermal insulation
- cushions organs such as eyes and kidneys
- contributes to body contour
- secretes hormones that regulate metabolism
brown adipose tissue (brown fat)
found mainly in fetuses, infants, and children
brown adipose tissue - functions
functions as a heat-generating tissue