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Theory:

It is the system that regulates the various functions of the body so that the internal environment is well balanced and maintained.
The system consists of the endocrine glands of the body, which produces chemical substances known as hormones
Glands and hormones
What are hormones?
Hormones are chemical substances that affect a wide range of bodily functions such as hunger, reproduction, and growth.
thyroid-1405039_1280.png
Hormones
 
These hormones are produced by the \(9\) endocrine glands of the body such as:
  • Pituitary gland
  • Pineal gland
  • Thymus gland
  • Thyroid gland and parathyroid gland
  • Pancreas
  • Testicles in male
  • Adrenal gland
  • Ovary
  • Hypothalamus
Endocrine_English.svg
Human endocrine system
 
Pituitary gland
  
It is a small gland that in the size of pea found at the base of the brain. It is known as the master gland as it controls the functions of all the other glands.
 
Thyroid gland
  
These glands can be found at the front of the neck. It produces hormones that influence the body's rate of metabolism.
 
Parathyroid gland
  
These glands can be found behind the thyroid glands of the neck and are involved in influencing the levels of calcium in the body.
 
Thymus gland
  
It is a gland found in the chest and plays a prominent role in immunity.
 
Adrenal gland
  
These glands are found on the top of the kidneys and produce the fight or flight hormone. It is a stress hormone that is helps the organism to either face a dangerous situation or to avoid it altogether.
 
Pancreas
  
The islets of Langerhans of the pancreas are endocrine in function as they produce the hormone known as insulin which maintains the sugar levels of the blood.
 
Pineal gland
  
It is a gland that is located between the two halves of the brain. It is a pea-shaped gland and secretes a hormone that plays a role in regulating sleep patterns.
 
Testes
  
It is a male sex organ that produces hormones in males.
 
Ovaries
  
It is a female sex organ that produces hormones in females.
Reference:
https://upload.wikimedia.org/wikipedia/commons/7/78/Endocrine_English.svg