- Brain, Spinal chrods, and nerves
Contracts to cause movement
Forms boundaries between different environments, protects, secretes, absorbs, filters
Epithelial tissues are liners
Supports, protects, and binds other tissues together
lose the connecting brdge of cells that links them to the parent epithelium. Their secretoins go directly into the bloodstream
Ductless and they release their secretions, called hormones, into the bodys extracellular compartment
Some best known endocrine glands are the pancrease, theyroid gland, gonads, and the pituitary gland.
Are watery solutions, and many of them contain enzymes.
Tears, sweat, and digestive enzyme solutions are all serous exocrine secretions
Release their secretions to the bodys external environment---This may be onto the surface of the skin or onto an epithelium lining one of hte internal passageways, such as the airways of the lung or the lumen of the intestine. In effect the exocrine secretion leaves the body ---> This explains how some exocrine secretions, like stomach acid, can have a pH that is incompatible with life
Most exocrine glands release their products through open tubes known as ducts.
Sweat glands, mammary glands in the breast, salivary glands, the liver, and the pancreas are all exocrine glands.
Single layer of flattened cells with disc shaped central nuclei and sparse cytoplasm ;the simpliest of the epithelia
It allows a passage of materials through diffusion and filtration in sites where protection is not important; secretes lubricating substances in serosae
Its located in the kidney glomeruli; air sacs of lungs; lining of heart, blood vessels, and lymphatic vessels; lining of ventral body cavity
Cells are long, cylindrical, striated, and multinucleate. Neurogenic only. Voluntary
Its combined with connective tissues and neural tissue in skeletal muscles
It moves or stabalizes the position of the skeleton; guards entrances and exits to the digestive , respiratory, and urinary tracts; generates heat; protects internal organs
cells are short, branched, and striated, usually with a single nucleus; cells are interconnected by intercallated discs. Myogenic only. Involuntary
Located in the heart
It circulates blood; maintains blood (hydrostatic) pressure
Cells are short, spindle shaped, and nonstriated, with a single, central nucleus. Myogenic and neurogenic. Involuntary
Found in the walls of blood vessels and in digestive, respiratory, urinary and reproductive organs
It moves food, urine, and reproductive tract secretions; controls diameter of respiratory passageways; regulates diameter of blood vessels
'Fluid compartments,' and the exchange of substances between the compartments, is a fundamental property of homeostatic mechanisms
Is fundamentally a property of cells, but it operates across all organizational levels
must occur between fluid compartments of the body, and between the body and the external environment
Takes place along cell membrane
prevent movement between adjacent cells.
Substances must instead pass between the epithelial cell, crossing two phospholipid cell membranes as they do so
When theres high environmental temperature.
Maximize heat loss:
When theres high environmental temperature
Minimize heat production
Diminish food intake to lessen obligatory heat production
Behavioral response- decrease physical activity
When theres low environmental pressure
Minimize heat loss
When theres low environmental pressure
Maximize heat production
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