There are several types of organs present in the human body, each with its own unique structure and function. These organs work together to carry out various essential processes that are necessary for the survival and well-being of an individual. Here is an explanation of the major organ systems in the human body and their functions:

1. Circulatory System:
The circulatory system consists of the heart, blood vessels, and blood. Its main function is to transport oxygen, nutrients, hormones, and waste products throughout the body. The heart pumps blood, while the blood vessels act as a network of highways, carrying the blood to all parts of the body.

2. Respiratory System:
The respiratory system includes the lungs, trachea, and bronchi. Its primary function is to facilitate the exchange of oxygen and carbon dioxide between the body and the environment. The lungs help in the oxygenation of blood and the removal of carbon dioxide through breathing.

3. Digestive System:
The digestive system comprises organs such as the mouth, esophagus, stomach, small intestine, large intestine, liver, and pancreas. It is responsible for the breakdown of food into nutrients, absorption of these nutrients into the bloodstream, and elimination of waste products from the body.

4. Nervous System:
The nervous system consists of the brain, spinal cord, and nerves. Its main function is to control and coordinate the activities of different parts of the body. It receives and processes sensory information, initiates responses, and maintains homeostasis.

5. Muscular System:
The muscular system includes muscles, tendons, and ligaments. It enables movement, provides support and stability to the body, and helps in maintaining posture. Muscles are responsible for locomotion, facial expressions, and other bodily movements.

6. Skeletal System:
The skeletal system is composed of bones, cartilage, and joints. It provides structural support, protects vital organs, facilitates movement, and produces blood cells. Additionally, it stores minerals such as calcium and phosphorus.

7. Excretory System:
The excretory system consists of the kidneys, ureters, bladder, and urethra. Its primary function is to remove waste products, excess water, and toxins from the body through urine production. It also helps in maintaining the body's fluid and electrolyte balance.

8. Endocrine System:
The endocrine system includes glands such as the pituitary, thyroid, adrenal, and reproductive glands. It regulates bodily functions through the secretion of hormones, which act as chemical messengers. These hormones are involved in processes such as growth, metabolism, reproduction, and stress response.

9. Reproductive System:
The reproductive system differs between males and females but is responsible for the production and development of offspring. In males, it includes the testes, penis, and associated structures, while in females, it comprises the ovaries, uterus, fallopian tubes, and vagina.

10. Integumentary System:
The integumentary system comprises the skin, hair, and nails. It acts as a protective barrier against external factors, regulates body temperature, and plays a role in sensation.

These organ systems work together harmoniously to ensure the proper functioning of the human body, allowing individuals to lead healthy and fulfilling lives.

The adult human body is made up of 100 trillion cells,206 bones,639 muscles and nearly 78 organs in our body according to shape,size and function, from which 22 are internal organs. An organ is a collection of millions of cells which group together to perform single functions in a our body.