Circulatory system

• The circulatory system is responsible for transporting oxygen, nutrients, hormones, and waste products throughout the body.
• The blood is a fluid that carries oxygen and nutrients around the body
• Double blood circulation: The heart pumps blood to the lungs and the body, then back to the heart.
• Single blood flow is seen in fish
• Double blood flow is seen in humans
• When you exercise your heart rate will go up because your body needs more oxygen to supply the muscles
• CHD is a risk factor for stroke, heart attack, and heart failure
• CHD stands for coronary heart disease, which is a condition where the coronary arteries become blocked by fatty deposits
• There are four chambers in the heart: right atrium, right ventricle, left atrium, and left ventricle.
• Valves are in the heart to prevent backflow of blood and to allow blood to flow in one direction only
• 1. blood is pumped away from the heart in arteries and returns to the heart in veins
• Blood leaving the right ventricle is deoxygenated and is pumped to the lungs
• the apex of the heart will always point to the left side of the body
• having a good diet and exercising reduces the risk of coronary heart disease