ENDOCRINOLOGY > the science of the endocrine, or ductless glands and their function
HORMONE > a substance originated in an organ, gland, or body part that is conveyed thru the blood to another body part, chemically stimulating that part to increase or decrease activity;
Secretion of a ductless gland
EXOCRINE GLAND > a gland with ducts
ENDOCRINE GLAND > a ductless gland that produces an internal secretion discharged into the blood or lymph and circulated to all parts of the body
HOMEOSTATSIS > equalibrium within the body
METABOLISM > all energy and material transformations that occur within living cells
PITUITARY GLAND > aids in growth, reproduction, and various metabolic activities
THYROID GLAND > endocrine gland located at the base of the neck
PARATHYROID GLAND > several small endocrine glands located on the lower edge of the thyroid; secretes hormone to regulate calcium & phosphorus metabolism
THYMUS > located above the heart composed of two fused lobes;
Grows till puberty, then atrophy's away
ADRENAL GLAND > triangular gland located above the surface of each kidney
PANCREAS > located behind the stomache;
Produces insulin
***HOMEOSTASIS***
Depends on regulation of organs and organ systems
Two systems responsible for homeostasis........
They help to regulate & coordnate other organs
They do this in different ways
Nervous system ---> regulates and controls by sending messages to the nerve cells which stimulate action
Endocrine System ---> Acts by sending hormones/chemicals thru the blood
Nervous system acts quickly and has short term effects
Endocrine system responds slower and has a longer lasting effect
***Functions Of The Endocrine System***
Regulates metabolism and growth
Regulates body's response to stress
Regulates sexual characteristics and reproduction
- endocrine glands secrete products into ducts that exit the glands and carry the secretion to another surface such as the skin or digestive system
- Exocrine glands secrete products into ducts that exit the glands & carry the secretion to another surface such as the skin or digestive system
***Facts***
- located in widely seperated parts of the body
- related to the Nervous System
- Well supplied with blood , very vascular
Inter-related actions
Made of connective and epithelial tissue
All secrete hormones
***HORMONES***
Hormone --> a a chemical made by the body
Concentration of one hormone