Respiratory and Circulatory System Review for Biology Exam Questions and answers

Respiratory and Circulatory System Review for Biology Exam Questions and answers What is the path of blood flow through the circulatory system? Blood enters through the vena cava into the right atrium, then through the tricuspid valve into the right ventricle. It goes through the pulmonary artery to the lungs, returns via the pulmonary vein to the left atrium, then through the bicuspid valve into the left ventricle, and finally through the aorta to the body. How is breathing accomplished? Inhaling involves the contraction of the diaphragm and intercostal muscles, expanding the lungs and decreasing pressure to draw air in. Exhaling involves the relaxation of these muscles, pushing air out. What is the difference between internal respiration and external respiration? External respiration is the exchange of air between the lungs and blood, while internal respiration is the gas exchange between blood and body cells. What are the two requirements for respiratory systems? A respiratory surface for gas exchange and moisture for gases to dissolve. What is the function of the nasal conchae? To warm, moisten, and filter the air using cilia that trap particles.