The lungs and pulmonary system (Opens a modal) Red blood cells (Opens a modal) Circulatory system and the heart (Opens a modal) Hemoglobin (Opens a modal) Components of blood (Opens a modal) The neuron and nervous system. Human body parts comprise a head, neck and four limbs that are connected to a torso. Organs keep the body functioning and maintain life. Human body internal parts such as the lungs, heart, and brain, are enclosed within the skeletal system and are housed within the different internal body cavities. There are at least 10 times as many bacteria in the human body as cells. Physiology: The study of the functioning body organs. The human body contains nearly 100 trillion cells. B. Cavity: A space within the body that contains various internal organs. Biology library. Explore the anatomy systems of the human body! Welcome to Innerbody.com, a free educational resource for learning about human anatomy and physiology. The human body, like that of many other multicellular organisms, is divided into a number of body cavities. We additionally come up with the money for variant types and as well as type of the books to browse. Unit: Human biology. Giving the body its shape is the skeleton, which is composed of cartilage and bone. Human Biology. Lessons. 1.1 Structural Organization of the Human Body * Before you begin to study the different structures and functions of the human body, it is helpful to consider its basic architecture; that is, how its smallest parts are assembled into larger structures. Unit: Human biology. Your skin is considered an organ, and its purpose is to protect the body from outside contaminants such as germs and pollution. The human body's ability to adapt to different environmental stresses allows humans to acclimatize to a wide variety of temperatures, humidity, and altitudes. The average adult takes over 20,000 breaths a day. 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