Science // Biology // B1 // Heart & Circulatory //
- Created by: ameburrell9
- Created on: 10-11-14 17:51
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- Heart and Circulatory System
- Picture of the Heart and Circulatory system
- The heart is a four-chambered muscular pump which pumps blood round the circulatory system
- The right side of the heart pumps de-oxygenated blood to the lungs to pick up oxygen
- The left side of the hear pumps the oxygenated blood from the lungs around the rest of the body
- 1. Deoxygenated blood enters through the vena cava in the right atrium
- 2. It;s then pumped through a valve into the right ventricle chamber
- 3. And then through the pulmonary valve into the pulmonary artery towards the lungs
- 5. It's then pumped through a valve into the lft ventricle
- 6. And then through the aortic valve and out the aorta to te rest of the body
- 5. It's then pumped through a valve into the lft ventricle
- 3. And then through the pulmonary valve into the pulmonary artery towards the lungs
- 2. It;s then pumped through a valve into the right ventricle chamber
- More depth details
- How blood is imported
- Arteries (thick walled muscular tubes) carry blood away from the hear at high pressure in thick walled lumen
- Then the capillaries (very narrow tubes) have thin walls to allow glucose and oxygen to diffuse through
- Then the veins (thin walled tubes) carry low pressure blood back to the hear. Veins have thinner walls and valves to prevent backflow of blood
- Then the capillaries (very narrow tubes) have thin walls to allow glucose and oxygen to diffuse through
- Arteries (thick walled muscular tubes) carry blood away from the hear at high pressure in thick walled lumen
- Heart disease
- Blood vessels called the coronary arteries supply blood to the heart muscles. If they become blocked a heart attack occurs
- Factors for heart disease
- Smoking
- High blood pressure
- High levels of salt in the diet
- High levels of saturated fat in the diet
- Fatty deposits build up in the coronary arteries and a blood clot can form on that fatty deposit which then the blood clot can block a coronary artery
- This means some of the heart muscle cells do not get the oxygen and nutrients they need and the cells begin to die
- Factors for heart disease
- Blood vessels called the coronary arteries supply blood to the heart muscles. If they become blocked a heart attack occurs
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