Human Body Systems Definition and their Functions

Human Body Systems

Firstly, the human body has a number of biological systems. However, human body systems carry out specific functions that are necessary for the everyday living of a human being. 11 organ systems are present in the human body. Notably, these organs include the circulatory system, respiratory system, digestive system, excretory system, nervous system, and endocrine system. On the other hand, the immune, integumentary, skeletal, muscle and reproductive systems are also part of the body of a human being. Following are the Human Body Systems –

• Circulatory System
• Digestive System
• Endocrine System
• Immune System
• Lymphatic System
• Nervous System
• Muscular System
• Reproductive System
• Respiratory System

Circulatory System

The circulatory system is a human body system that moves the blood, nutrients, oxygen, carbon dioxide, and hormones, around the human body. It consists of the blood, blood vessels, arteries, and veins.

Digestive System

In the human body systems, there is a digestive system that consists of a series of organs that have a connection together. This system allows the body to break down and let it absorb the food and remove the waste. It has mouth, esophagus, stomach, large intestine, small intestine, rectum, and anus. The liver and the pancreas also play an important role in the digestive system because they form digestive juices that help in the digestion.

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Endocrine System

The endocrine system consists of 8 major glands. These glands secrete hormones into the blood. These hormones, in turn, travel to various tissues and regulate multiple bodily functions. Some of these functions are metabolism, growth, and sexual function.

Immune System

The immune system is the body’s defense against the viruses, bacteria and other pathogens that might be very harmful. It also has lymph nodes, bone marrow, spleen, lymphocytes (includes B-Cells and T-Cells), the leukocytes and thymus, these are the white blood cells.

Lymphatic System

In the list of the human body systems, the lymphatic system is having lymph nodes, lymph ducts, and the lymph vessels. It also plays a role in the defenses of the body. It helps the body in fighting with infection. The lymphatic system also removes extra lymph fluid from the bodily tissues and sends it back to the blood.

Nervous System

In the list of the human body systems, the nervous system is a system that controls both the actions, the voluntary action and the involuntary actions as well. It also sends signals to different parts of the human body. However, the central nervous system includes the spinal cord and the brain as well. The peripheral nervous system has nerves that connect all the other parts of the human body to the central nervous system.

Muscular System

The muscular system of the body contains about 650 muscles that aid in movement, the flow of blood and many other bodily functions. There are 3 types of muscles: skeletal muscle, smooth muscle, and cardiac muscle. The smooth muscle is present inside the organs and helps in moving substances through the organs. The cardiac muscle is present in the blood and helps in pumping the blood.

Reproductive System

The reproduction is one of those body systems that allow us to reproduce. The male reproductive system has a penis and testes. The male reproductive system produces sperm. The female reproductive system has a vagina, the uterus, and ovaries that produce eggs. Moreover, during the conception process, the sperm cell fuses with an egg cell that forms fertilized eggs. These eggs implants and grows in the uterus.

Respiratory System

This system allows us to take in vital oxygen and expel carbon dioxide in a process we call breathing. Read more about the Respiratory System.

Solved Question on Human Body System

Ques. Inspiration and Expiration process is done by:

(A). Digestive system.
(B). Skeletal system.
(C). Muscular system.
(D). Respiratory system.

Ans. (D). Respiratory system.