Circulatory system

• Arteries have thick, elastic walls that allow them to withstand the high pressure of blood pumped by the heart.
• The circulatory system is responsible for transporting oxygen, nutrients, hormones, and waste products throughout the body.
• Capillaries are tiny vessels where exchange between cells and blood occurs through diffusion.
• Veins are thinner than arteries but still contain smooth muscle tissue and valves to prevent backflow of blood.
• The septum consists of muscle and fibrous tissue that divides the heart into the left and right sides.
• The septum consists of muscle and fibrous tissue that divides the heart into the left and right sides.
• Blood flows from the right atrium into the right ventricle through the tricuspid valve.
• The atria receive blood as it enters the heart. The ventricles are stronger and pump blood out to the lungs and body.
• The heart has four chambers - two atria and two ventricles.
• The heart has four chambers: atria (right atrium and left atrium) and ventricles (right ventricle and left ventricle).
• The heart is located between the lungs, behind the sternum (breastbone), and to the left side.
• Arterioles are small blood vessels that branch out from arteries and carry blood to capillaries.
• The heart is made up of cardiac muscle tissue, which allows it to contract and pump blood effectively.
• Blood vessels are tubes made up of three layers: tunica intima (innermost layer), tunica media (middle layer), and tunica adventitia (outermost layer).
• Blood vessels are tubes made up of three layers: tunica intima (innermost layer), tunica media (middle layer), and tunica adventitia (outermost layer).
• The circulatory system consists of the heart, blood vessels, and blood.
• Blood flows through the circulatory system in a closed loop called circulation.
• Veins return deoxygenated blood to the right atrium of the heart.