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13 Cards in this Set
- Front
- Back
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Role of human heart |
- it's an organ - it pump blood around body via circulatory system - supplies oxygen and nutrients to tissues -removes carbon dioxide and other wastes |
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Left ventricle |
-thicker more muscular wall -needs to pump blood further round the body |
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Right ventricle |
- pumps blood to lungs for gas exchange - left ventricle pumps blood around rest of body |
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Double circulatory system |
Blood travels through the heart twice on a complete circuit of the body |
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Aorta |
Main ARTERY leaving the heart Carries out the left ventricle and around the body |
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Vena Cava |
Main VEIN from the body. Carries deoxygenated blood from body to right atrium |
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Pulmonary Vein |
Carries oxygenated blood from lungs to left atrium |
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Pulmonary Artery |
Carries deoxygenated blood to the lungs from right ventricle |
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Lungs |
Helos oxygen from the air we breathe move into the red blood cells |
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Adaptations of lungs |
Folded - provides greater surface area for gas exchange Alveoli walls - one cell thick so makes distance for diffusion to occur shorter Alveolus - surrounded by blood capillaries for a good blood supply Alveolus - ventilated to remove CO2 and replenish oxygen levels Alveoli walls - moist so gases can dissolve and diffuse more effectively through them |
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Key Structures in Lungs |
1. Air enters through mouth and travels down trachea to the lungs 2. The bottom of the trachea splits into left and right bronchi 3. Each bronchi branches into bronchioles which end in small bags called alveoli where gas exchange takes place |
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Blood vessels - Arteries |
Thick elastic muscular wall Small lumen for blood transportation at high pressure from the lungs |
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Arteries - Veins |
DONT carry high pressure blood Thinner wall and larger lumen than arteries They have valves to keep lower pressure blood flowing in the right direction |
