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Transcript of Circulatory System
By: Luke and Patrick The Circulatory System is also called the Cardiovascular System. The circulatory system carries needed substances to cells and waste products away from cells. The circulatory system consists of the heart, blood vessels, and the blood. The heart is a hollow muscular organ the pumps blood through out the body Each time the heart beats it pumps blood through the blood vessels of the cardiovascular system. Within a tiny droplet of blood, there are some 5 million red blood cells One drop of blood has about 5 million red blood cells and 12 thousand white blood cells The heart has four chambers Left atrium
Right ventrical Your heart has four chambers Humans have a closed circulatory system All humans have a closed circulatory system An average adult contains five to six quarts of blood The human circulatory system has a 2 loops In the first loop of the circulatory system the blood is pumped through the lungs and then back to the heart. The second loop of the system blood is pumped from the heart to the and then returns to the heart. The aorta carries blood from the left ventricle to the body. The Aorta The System What Does It Have In It? What It Does? The Heart What Happens? Blood Cells What Is In It? Closed or Open? How Much? Loops The First Loop The Second Loop Right Atrium The right atrium recevies blood from the body that is low in oxogen and high in carbon dioxide Right Ventricle The right ventricle pumps oxogen-poor blood to the lungs Left Atrium Oxygen-rich blood moves from the lungs into the left atrium Left Ventricle The left ventricle pumps oxogen rich blood to all parts of the body The action of the heart has two main phases The First Phase The heart muscle relaxes and fills with blood Second Phase The heart muscle contracts and pumps blood forward Regulation of heart beat A group of heart cells called the pacemaker sends out signals that make the heart muscle contract. The pacemaker constantly receives messages about the bodies oxygen needs. It then adjusts the heart rate to match What it does Arteries Arteries are blood vessels that carry blood away from the heart From The Arteries From the arteries blood flows into tiny narrow vessels called capillaries From the Capillaries From the capillaries blood flows into veins, blood vessels that carry blood. Fun Fact If all the arteries,capillaries,and veins in your body where hooked together end to end they would stretch 100000 km. That long enough to wrap around the world twice. Arteries Again When blood leaves the heart it travels through the arteries. smaller arteries branch off the aorta. the first branches called the coronary arteries carry blood to the heart. Other branches carry blood to other organisms Structure The walls of arteries are generally very thick, they consists of three layers. The inner layer is smooth which allows blood to flow freely. The middle layer is muscle tissue and the outer wall is made up of flexible connective tissue. Pulse Pulse is caused by the alternating expatiation and relaxation of the artery wall. Capillaries Blood flows from cmall arteries into small capillaries. in the capillaries matreials are exchanged between the blood and the bodies cells. their wall are only one cell thick. Materials such as blood and glucose pass from the blood through the capillaries walls to the cells. Waste does the exact opposite Continued Veins After blood mover through capillaries, it enters larger blood vessels called veins, which carry blood back to the heart. Arteries Veins Blood Pressure Blood exerts a force, called blood pressure, against the walls of the blood vessels. Blood pressure is caused by the force with which the ventricles contract. Blood Blood is made up of four components: plasma, red blood cells, white blood cells, and platelets