Tissues of the Body. From Cells to Organ Systems. Cells combine to form tissues, and tissues combine to form organs. Tissues are groups of cells closely associated that have a similar structure & perform a related function. Cells combine to form 4 primary tissues
Cells combine to form tissues, and tissues combine to form organs
Tissues are groups of cells closely associated that have a similar structure
& perform a related function
Covers the body
Lines the cavities, tubes, ducts and blood vessels inside the body
Covers the organs inside body cavities
Epithelial Tissue Functions:
Protection from physical & chemical injury,
Protection against microbial invasion,
Contains receptors which respond to stimuli,
Filters, secretes & reabsorbs materials and
Secretes serous fluids to lubricate structures.
Nutrients from capillaries in underlying connective tissue
Nerves pass through
Different cell shapes & arrangements
Stratified: multiple layers and cell shapes
Classes of Epithelia
TYPE CELL SHAPE EXAMPLE
give rise to
Endothelium (lines blood vessels), mesothelium (serous lining of celom)
Walls of glands
Lining of gut tube; sometimes with cilia like lining of uterine tube
With cilia in respiratory tubes to move mucous & particles out of the lungs
One cell thick
Forms solid layer of cells which line blood vessels, body cavities & cover organs in body cavities
One cell thick, roughly cube shaped
Lines ovaries, kidneys, thyroid glands, where secretion & absorption take place
One cell thick column shaped (long & narrow)
Line digestive tract where re-absorption & secretion occurs.
Associated with the bones of the skeleton, the heart and in the walls of the hollow organs of the body.
Muscle Tissue Functions:
Movement & Locomotion
Connective tissue location:
Most abundant & widely distributed tissue
Connective tissue has non-living extra-cellular material (matrix between its cells
Connective Tissue Functions:
Connects, binds and supports structures,
Tendons, ligaments, etc.
Protects & cushions organs and tissues,
Insulates (fat) and
Transports substances (blood).
Collagen gives structure
Reticular fibers (crossed collagen) gives order
Elastin gives elasticity
Jelly-like material made of sugar-protein molecules (proteoglycans)
Allows connective tissue to retain water and serve as support and protection of organs
Type: Loose, areolar
Collagen is the main matrix element
Thick fibers running in many planes
Dermis, fibrous capsules around organs
Aligned parallel fibers that resists tension
Main component of the nervous system ie., brain, spinal cord & nerves.
Nervous Tissue Functions:
Regulates & controls body functions
Generates & transmits nerve impulses
Supports, insulates and protects impulse generating neurons.