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This section will examine 4 systems. Skeletal, Muscular, Circulatory and Respiratory Systems. The Skeletal & Muscular Systems is the interdependence of the skeletal and muscle systems. Related themes are bone structure, muscle types and their functions. The Skeletal & Muscular Systems explores the characteristics and functions of the bones and joints in the human skeletal system.  Also examined are the muscles, tendons and ligaments that work in conjunction with the skeletal system to provide movement for the body. Students will enjoy learning about the interdependence of these systems and the ways to maintain healthy bones and muscles. The respiratory system delivers oxygen into the blood, and excretes carbon dioxide waste.  Oxygen enters the lungs and carbon dioxide exits the lungs.  Inhalation occurs because of the diaphragm enlarging, causing oxygen to rush in, and elastic rebound causing the carbon dioxide to be forced out.  Oxygen enters the blood at the alveoli in the lungs; it enters naturally because of passive diffusion, there is less oxygen in the blood then the lungs.  Carbon dioxide exits the blood the same way. The circulatory system delivers oxygen and nutrients from the blood into the tissues, and picks up carbon dioxide and waste for excretion.  The circulatory system is made of the heart and blood vessels.  The blood vessels narrow into capillaries to deliver the oxygen by passive diffusion into the body's cells.  The blood circulates through two systems, the pulmonary circuit and the systemic circuit.

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1. Circulation & The Blood.ppt5.57 MB