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May 26, 2024 · Learn about the structure and function of the human body, its organs, systems, and tissues. Explore the chemical composition, development, and evolution of the human body with Britannica's articles and diagrams.
- The Editors of Encyclopaedia Britannica
Learn about the skeletal, muscular, cardiovascular, digestive, endocrine, nervous, respiratory, immune/lymphatic, urinary, female reproductive, male reproductive, and integumentary systems of the human body. Select a system to get started and explore its anatomy, functions, and disorders.
Jan 26, 2024 · Learn about the vital and non-vital organs of the body and their functions, and how they work together in different organ systems. See an interactive body map and diagram of the organs and their locations.
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).
- 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).
Zygote Body is a free online 3D anatomy atlas. View, isolate, and learn human anatomy structures with Zygote Body.
Complete Guide on Human Anatomy with Parts, Names & Diagram. Overview of Human Anatomy and Physiology. The human body comprises 200 bones, 650 muscles, 79 organs, and an extensive network of blood arteries.
