The endocrine system consists of glands that secrete hormones directly into the bloodstream to regulate the body. In contrast, the exocrine system secretes chemicals through ducts. Secretion is the process by which cells and glands produce and release substances like enzymes and hormones. The gastrointestinal tract, lungs, sebaceous glands, and meibomian glands are some tissues that secrete chemicals in humans. Thirst is a sensation associated with craving water and is an essential mechanism for fluid balance triggered by a lack of fluids or increase in osmolites like salt. Excess thirst can indicate medical conditions like diabetes.

1. Presentation 11
BY
KIDANE HAILEMICHAEL

2. Endocrine System
- crine – means to secret

3. Endocrine System
 The endocrine system is the system of glands, each of which
secrets a type of hormone directly into the blood stream to
regulate the body
 The endocrine system is in contrast to the exocrine
system, which secrets it’s chemicals using ducts
 It derives from the Greek words “endo” meaning
inside, within, and “crinis” meaning secrete

4. Secret
 To secret means to produce and discharge a
substance, especially from the cells of specialized
glands
 Secretion is the process of elaborating, releasing and
oozing chemicals, or secreted chemical substances
from a cell or a gland
 In contrast to excretion, the substance may have a certain
function, rather than being a waste product

5. Secretion in Human Tissues
 Many human cell types have the ability to secret cells
 They have a well developed endoplasmic reticulum and
Golgi apparatus to fulfill their function
 Tissues in humans that produce secretions include;
 The gastrointestinal tract – Which secret enzymes and gastric acid
 The lung – Which secrets surfactants
 Sebaceous glands – Which secret sebum, o lubricate the skin and
hair
 Meibomian glands – In the eyelids secret sebum to lubricate and
protect the eye

6. -dipsia
-dipsia means thirst

7. Thirst
 Thirst is a sensation, often referred to the mouth and
throat , associated with the craving for drink;
ordinarily interpreted as a desire for water
 It is an essential mechanism involved in fluid
balance
 It arises from a lack of fluids and an increase in the
concentration of certain osmolites, such as salt

8. Thirst
 If the water volume of the body falls below a certain
threshold or the osmolite concentration becomes too
high, the brain signals thirst
 Extracellular thirst is thirst generated by decreased
volume
 Intracellular thirst is thirst generated by increased
osmolite concentration

9. Thirst
 In adults over the age of 50years, the body’s thirst sensation
reduces and continues deteriorating with age, putting this
population at increased risk of dehydration
 The recommended intake of water is 2 litters for females
and 2.5 litters for males
 Drinking lots of water is usually healthy. However, the urge
to drink too much may be the result of physical or
emotional disease
 Excess thirst maybe a symptom of high blood sugar
(hypoglycemia). It can be an important clue in detecting
diabetes

10. References
 medlinePlus.com
 thefreedictionary,.com
 Wikipedia.org