Problem 1: Describe the oxygen and carbon dioxide role in circulation for the organs below: stomach (digestive tract), kidney (not urinary tract), muscles (cells in the body), heart (cardiovascular system), and lungs (respiratory system).
Problem 2: Describe the different blood vessels (blood flow, vales, structure..): arteries, arterioles, veins, capillaries, and venules.
Problem 3: What is the relative size of the heart?
Problem 4: What is the flow of blood through the heart vessels and chambers of the heart?