Hey everyone! We get to know some systems of human body in the previous blog. Let's continue in this blog.

RESPIRATORY SYSTEM 

Air from the external world enters the body through the upper airways. The central organs, the lungs, absorb oxygen and expel carbon dioxide. The lungs send oxygenated blood to all the cells via the circulatory system and in turn receive blood that requires purification.

ENDOCRINE SYSTEM 

The endocrine system is formed by glands that are distributed throughout the body. Its primary function is to produce hormones, the body's chemical messengers. These hormones are responsible for various activities of human body including mood. The endocrine system secretes the hormones into the bloodstream so that they can reach the organs they are designed to influence, excite or stimulate for such activities as growth and metabolism.

MUSCULAR SYSTEM 

Its function is to define the shape of the organism and protect it. The muscular system is essential for producing movement. It consists of muscles, organs made of fleshy tissue, and contractile cells.

There are two types of muscles : striated and smooth. Striated muscles are attached to the bones and govern voluntary movements of body. Smooth muscles also obey the brain, but their movement is not under voluntary control. The myocardium, the muscle tissue of the heart, is unique and is in a class by itself.

DIGESTIVE SYSTEM 

This system is a large tract that changes form and function as it goes from the mouth to the rectum and anus, passing through the pharynx, the oesophagus, the stomach and the small and large intestines. The liver and pancreas help process ingested food to extract its chemical components. Some of these components are welcome nutrients that are absorbed by the system, but others are useless substances that are discarded and eliminated.

URINARY SYSTEM 

This system is a key system for homeostasis - that is, the equilibrium of the body's internal conditions. Its specific function is to regulate the amount of water and other substances in the body discarding any that are toxic or that form an unnecessary surplus. The kidneys and the bladder are the urinary system's principal organs. The ureters transport the urine from the kidneys to the bladder, and the urethra carries the urine out of the body. 

All these systems are interlinked and interconnected in many ways to carry out various functions of human body.

Thank you for reading. Have a great day ahead!