Human body is like machine. It is uniquely designed, as it consists of various biological systems, that are regulated by internal organs. Read more, to get detailed information on internal organs of human body.
Human body can be divided into head, trunk, hands, and legs. Head and the trunk plays a major role in protecting some crucial internal organs of human body. They consist of many tissues, cells and connective tissues, that help in regulating various biological systems.
Some of the major organ systems are skeletal system, circulatory system, nervous system, digestive system, immune system, respiratory system, urinary system, reproductive system, lymphatic system, and endocrine system, etc., which are overlapping and interdependent.
List of Internal Organs of Human Body
digestive system diagram
Brain: The human brain is protected by the skull and it is enclosed in the cranium keeping it very safe, since it is the center of the nervous system. The structure of the human brain can be compared with other mammals, but it is three times bigger and more advanced than other mammals. It houses our cherished memories, future plans, and keeps us alert in the present. The brain helps the body to activate muscles and it secretes chemicals that allow to respond to the external stimuli. No other animals have the ability to 'think' and weigh things logically. But, the human brain performs some executive functions, such as, self control, planning, reasoning, and abstract thinking, that makes human beings the most intelligent species on entire earth. More on: diagram of brain and its functions.
digestive system diagram
Heart: Primary function of the heart is to provide de-oxygenated blood to all the body organs through blood vessels by rhythmic contractions, also known as heart beats. The heart is made of involuntary cardiac muscles, and this is the reason why the heart continues beating even when we are asleep. The heart weighs 250 to 350 grams and is almost the size of the fist. It is located in the left side of the thorax and is protected by the rib cage. The pericardium, a double-walled sac, that encloses heart, not only protects the heart but anchors it's surrounding structure and prevents heart from overfilling with blood. More on cardiovascular system facts.
Lungs: Human body consists of two lungs and they lead the respiratory system functions. Lungs work very closely with the heart. Lungs provide the pure atmospheric oxygen to the blood that's in turn circulated by the heart to various body organs. The lungs also remove carbon dioxide and other impurities from the blood veins. The heart is nearly flanked by lungs, so it also acts as a soft shock absorbent for the heart and also maintains the pH level of the blood.
