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 that consists of the endocrine glands of the body which produce chemical substances known as hormones
Endocrine glands and hormones:
What are hormones?
Hormones are chemical substances that effect a wide range of bodily functions such as hunger, reproduction, and growth.
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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 is a 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 prominent role in immunity.
 
Adrenal gland:
These glands are found on the top of the kidneys and produce the fight or flight hormone. This 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 an female sex organ that produces hormones in females.
Reference:
https://upload.wikimedia.org/wikipedia/commons/7/78/Endocrine_English.svg