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Sep 21, 2024 · The human body is the physical substance of the human organism. Characteristic of the vertebrate form, the human body has an internal skeleton with a backbone, and, as with the mammalian form, it has hair and mammary glands. Learn more about the composition, form, and physical adaptations of the human body.
- The Editors of Encyclopaedia Britannica
Learn about the human body, the entire structure of a human being composed of cells, tissues, organs and systems. Explore the elements, genome, tissues, organs and functions of the body, as well as its anatomy and physiology.
- 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).
Learn about the 12 major anatomy systems of the human body with detailed 3D illustrations. Explore the skeletal, muscular, cardiovascular, digestive, endocrine, nervous, respiratory, immune, urinary, reproductive, and integumentary systems.
Learn the terms and concepts of human anatomy, including organ systems, anatomical position, regional and directional terms, and body planes. Test your knowledge with practice questions and diagrams.
Learn anatomy faster with our 3D human anatomy models. Over 400 models, by region, by structure and by system.
The human body has many different parts. The science that studies the structures and arrangement of those parts is called anatomy, while the study of how they function is called physiology. The structural organization of the body starts at the cellular level.
