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2 days ago · Learn about the structure, function, and composition of the human body, the physical substance of the human organism. Explore the tissues, organs, systems, and biochemical constituents that make up the human body and how they develop and change over time.
- The Editors of Encyclopaedia Britannica
TheBody is a website that covers HIV-related topics, such as advocacy, health, stigma, and treatment. Learn from experts, activists, and people living with HIV about the latest research, trends, and challenges.
- Skeletal system. The skeletal system is composed of bones and cartilages. There are two parts of the skeleton; axial and appendicular. The axial skeleton consists of the bones of the head and trunk.
- Muscular system. The muscular system consists of all the body muscles. There are three muscle types; smooth, cardiac and skeletal muscles. Smooth muscle is found within walls of blood vessels and hollow organs such as the stomach or intestines.
- Cardiovascular system. The cardiovascular system is comprised of the heart and the circulatory system of blood vessels. The heart is composed of four chambers; two atria and two ventricles.
- Respiratory system. The respiratory system consists of a series of organs; the nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles and lungs (alveoli).
The human body is composed of elements including hydrogen, oxygen, carbon, calcium and phosphorus. These elements reside in trillions of cells and non-cellular components of the body. The adult male body is about 60% water for a total water content of some 42 litres (9.2 imp gal; 11 US gal).
Jun 20, 2023 · Learn about the structure and function of the human body's 11 organ systems, such as the circulatory, respiratory, digestive, skeletal, muscular, and nervous systems. Find out how each organ system works with others to perform essential activities like breathing, digestion, and movement.
Learn about the structure and functions of the human body, from the brain to the skin, with this comprehensive article. Explore the systems, organs, and diseases that affect the body's health and well-being.
Get introduced to the major organ systems of the human body! You’ll learn some general anatomy (a roadmap of your body), learn how the arm bone actually connects to the shoulder bone, and how the different organs work together to keep you alive.
