Cardiovascular System
- Created by: Aerociana
- Created on: 07-01-17 17:49
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- Cardiovascular System
- Blood Vessels
- Veins
- To the heart
- Thin walls
- Close to the surface
- High pressure
- Have valves to prevent backflow of blood
- Blood is deep red and de-oxygenated
- No pulse
- Arteries
- Thick walls
- Low pressure
- Deep in the skin
- Away from the heart
- Have a pulse
- Blood is bright red and oxgenated
- Capillaries
- One cell thick
- Gaseous exchange
- Oxygen passes through the capillary wall and into the tissues, carbon dioxide passes from the tissues into the blood
- Veins
- Blood
- Red blood cells
- Shaped like a bi-concave disc for increased surface area
- have haemoglobin which reacts with oxygen to carry it (oxyhaemoglobin) and makes the blood red
- Made in the bone marrow
- White blood cells
- Ingest pathogens
- Produce antibodies
- Made in the bone marrow
- Plasma
- Liquid part of blood
- Transports dissolved substances such as carbon dioxide, digested food, urea, hormones and heat
- Platelets
- Involved in blood clotting
- Red blood cells
- Heart
- Left side
- Deals with oxygenated blood
- Right side
- Deals with de-oxygenated blood
- De-oxygenated blood enters the right atrium through the vena cava
- The tricuspid valve opens and blood is pumped into the right ventricle
- The semilunar valve opens and deoxygenated blood is pumped back up to the lungs through the pulmonary artery
- The tricuspid valve opens and blood is pumped into the right ventricle
- Left side is bigger than the right because it has to pump further
- Stroke Volume x Heart Rate = Cardiac Output
- Left side
- Temperature control
- Vasoconstriction
- Blood vessels shrink down
- Heat can't be lost as easily to the air as the blood vessels are not as close to the surface
- Blood vessels shrink down
- Vasodilation
- Blood vessels swell or dilate
- Heat can be lost to the air as the blood vessels are closer to the surface
- Blood vessels swell or dilate
- Vasoconstriction
- Blood Vessels
- De-oxygenated blood enters the right atrium through the vena cava
- The tricuspid valve opens and blood is pumped into the right ventricle
- The semilunar valve opens and deoxygenated blood is pumped back up to the lungs through the pulmonary artery
- The tricuspid valve opens and blood is pumped into the right ventricle
- Oxygenated blood from the lungs enters the left atrium through the pulmonary vein
- The bicuspid valve opens and the blood pumped into the left venticle
- The semilunar valve opens and oxygenated blood is pumped around the body through the aorta
- Left side
- Deals with oxygenated blood
- The bicuspid valve opens and the blood pumped into the left venticle
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