The heart
- Created by: Former Member
- Created on: 08-03-15 13:41
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- The heart
- Exercise
- When you exercise you respire more
- increases amount of CO2 in body
- The brain sends signals to heart causing it to contract more frequently
- Blood vessels
- Arteries
- Carry blood under pressure
- Strong and elastic walls
- walls are thick compared to size of lumen. Contain thick layers of muscle to make them strong
- Capillaries
- Really small
- Carry blood close to every cell in body to exchange substances with them
- They have permeable walls ( one cell thick for diffusion. They supply food and oxygen and take away CO2
- Veins
- The blood is at low pressure, so the walls don't need to be thick
- Tthey have a bigger lumen to help blood flow despite low pressure
- They have valves to keep the blood flowing in one direction
- Arteries
- Heart rate
- The speed in which the heart contracts.
- Hormonal system
- When an organism, is threatened the adrenal glands release adrenaline
- This binds to receptors in heart causing the cardiac muscle to contract more frequently, so heart rate increases and heart pumps more blood
- This increases the oxygen supply to the tissues, getting the body ready for action
- When an organism, is threatened the adrenal glands release adrenaline
- Labels
- Pulmonary artery
- Pulmonary vein
- Semi-lunar valve
- Biscupid valves
- Triscupid valves
- Right ventricle
- Left ventricle
- Right atrium
- Left atrium
- Aorta
- vena cava
- The design
- The right atrium of the heart receives de oxygenated blood from the body
- The de oxygenated blood moves through the right ventricle which pumps it to the lungs
- The left atrium receives oxygenated blood from the lungs
- The oxygenated blood then moves to the left ventricle where it is pumped around the whole body
- The left ventricle has a much thicker wall than the right because it needs more muscle to pump the blood around the whole body, which means the blood is under higher pressure
- The valves prevent backflow
- Exercise
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