Respiration and Circulation

• Blood vessels are a network of arteries, veins, and capillaries that transport the blood throughout the body.
• Blood flows from the right atrium into the right ventricle through the tricuspid valve.
• Arteries carry oxygen-rich blood away from the heart to the body, veins carry deoxygenated blood back to the lungs and heart.
• The heart is located between the lungs, behind the sternum (breastbone), and to the left side of the body.
• <S>:The heart is a muscular organ that pumps oxygen-rich blood through the body.
• Veins return deoxygenated blood back to the heart.
• Arteries carry oxygenated blood away from the heart to other parts of the body.
• Capillaries connect arteries and veins and allow for exchange between tissues and blood.
• Blood flows from the right atrium into the right ventricle through the tricuspid valve.
• Oxygenated blood returns to the left atrium via pulmonary vein.
• The right ventricle pumps blood to the lungs through pulmonary artery.
• Left atrium contracts and sends blood to the left ventricle through bicuspid valve.
• The heart is located between the lungs, behind the sternum (breastbone), and to the left side of the body.
• Capillaries connect arteries with veins and allow exchange between cells and blood.
• The circulatory system consists of three main parts: the heart, blood vessels (arteries, veins, and capillaries), and blood itself.
• Atrioventricular valves prevent backward flow of blood during contraction of the ventricles.
• Capillary beds are networks of tiny blood vessels where gas exchange occurs with tissues.
• Capillaries are tiny vessels where gas exchange occurs with cells.
• Semilunar valves prevent backward flow of blood when the ventricles relax.
• Capillaries connect arteries and veins and allow for exchange of gases and nutrients with cells.
• Veins return deoxygenated blood to the heart.
• Mitral valve is called bicuspid valve
• Tricuspid valve separates right atrium from right ventricle
• Pulmonic valve separates right ventricle from pulmonary trunk (pulmonary artery)
• Aortic valve separates left ventricle from aorta
• Blood flows through the heart in one direction only due to valves that prevent backflow.
• Valves are flaps of tissue that open and close during the cardiac cycle.
• Atria are thin-walled chambers that receive blood from other parts of the body.