2.a. Many multicellular organisms have specialized structures to support the transport of materials.||CA Science||Grade 5||02. Life Sciences||2. Plants and animals have structures for respiration, digestion, waste disposal, and transport of materials.|||2.b. How blood circulates through the heart chambers, lungs, and body, and how carbon dioxide (CO2) and oxygen (O2) are exchanged in the lungs and tissues.||CA Science||Grade 5||02. Life Sciences||2. Plants and animals have structures for respiration, digestion, waste disposal, and transport of materials.|||6.j. Contractions of the heart generate blood pressure, and heart valves prevent backflow of blood in the circulatory system.||CA Science||Grade 7||06. Physical Science: Physical Principles in Living Systems||6. Physical principles underlie biological structures and functions.|||9.a. How the complementary activity of major body systems provides cells with oxygen and nutrients, and removes toxic waste products such as carbon dioxide.||Grade 9-12||03. Biology/Life Sciences||5. Physiology|| 9. As a result of the coordinated structures and functions of organ systems, the internal environment of the human body remains relatively stable (homeostatic), despite changes in the outside environment.
