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Mar 21, 2024 · Learn about the human body's organs, systems, tissues, and functions from Britannica's comprehensive articles. Explore the chemical composition, development, and diversity of the human body with diagrams, quizzes, and interactive features.
- 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.
Human anatomy is the study of the shape and form of the human body. The human body has four limbs (two arms and two legs), a head and a neck , which connect to the torso . The body's shape is determined by a strong skeleton made of bone and cartilage , surrounded by fat ( adipose tissue ), muscle, connective tissue , organs, and other structures.
- 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 the basics of human anatomy and physiology with this online course. Explore the structure and function of the circulatory, respiratory, endocrine, nervous, and other systems of the body.
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An Anatomy & Physiology Course for Everyone. The Visible Body Learn Site is our totally free introduction to each human body system. It furthers our mission to allow anybody anywhere to easily engage with our world-class visual human biology content. The 3D models on this website are completely interactive!
Jan 2, 2017 · Explore the human body's parts and organ systems from head to toe with links to descriptions and pictures. Learn about the anatomy of the brain, heart, lungs, skin, immune system, and more from various sources and topics.
