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The human body is the entire structure of a human being. It is composed of many different types of cells that together create tissues and subsequently organs and then organ systems. They ensure homeostasis and the viability of the human body.
May 26, 2024 · Learn about the structure, function, and composition of the human body, the physical substance of the human organism. Explore the major organs, systems, tissues, and cells, as well as the biochemical constituents and the process of aging.
- The Editors of Encyclopaedia Britannica
- Chemically, the human body consists mainly of water and organic compounds—i.e., lipids, proteins, carbohydrates, and nucleic acids. The human body...
- The four main types of tissue in the human body are epithelial, muscle, nerve, and connective.
- The nine major organ systems in the human body are the integumentary system, the musculoskeletal system, the respiratory system, the circulatory sy...
Learn about the skeletal, muscular, cardiovascular, digestive, endocrine, nervous, respiratory, immune, 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.
- 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).
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.
Learn about the structure and function of the human body, from cells to organ systems, and how it changes over time. Explore anatomy, physiology, and molecular biology with videos, quizzes, and articles.
Zygote Body is a free online 3D anatomy atlas. View, isolate, and learn human anatomy structures with Zygote Body.
