Circulatory System - the Heart
- Created by: cassiarh01
- Created on: 17-04-18 17:17
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- Circulatory System - the Heart
- Humans have double circulatory systems
- Made up of the heart, blood vessels and blood
- 1. In the 1st ciruit the heart pumps deoxygenated blood (without oxygen) to the lungs. The blood then picks up oxygen in the lungs
- 2. Oxygenated blood then returns to the heart
- 3. In the 2nd circuit the heart pumps oxygenated blood around to the other organs of the body, delivering oxygen to the body cells
- 4. Deoxygenated blood returns to the heart to be pumped out to the lungs again
- Heart pumps blood around the body
- Organ with 4 chambers. Walls made up of muscle tissue
- 1. Blood flows into the 2 atria from the vena cava and the pulmonary vein
- 2. The atria pump the blood into the ventricles
- 3. The ventricles pump blood out of the heart
- Blood from the right ventricle goes through the pulmonary artery to the lungs
- Blood from the left ventricle goes through the aorta to the rest of the body
- 4. The blood then flows to the organs through arteries, and returns to the heart through veins
- 5. The atria fill again - the whole cycle starts over again
- Valves in the heart stop blood flowing backwards
- The heart also needs it's own supply of oxygenated blood - from arteries called coronary arteries
- Which branch off the aorta and surround the heart
- The heart has a pacemaker
- Resting heart rate - controlled by a group of cells in the right atrium wall
- Tell the heart when to pump blood
- Resting heart rate - controlled by a group of cells in the right atrium wall
- Humans have double circulatory systems
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