The Heart (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
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Practise the cards
15 cards from this deck
Function of the heart
Function of the heart
Pumps blood throughout body in double circulatory system
Two circuits in double circulatory system
Two circuits in double circulatory system
Pulmonary and systemic circuits
Pulmonary circuit pathway
Pulmonary circuit pathway
Right atrium→right ventricle→lungs→back to heart
Systemic circuit pathway
Systemic circuit pathway
Left atrium→left ventricle→body→back to heart
Why left ventricle wall thicker than right
Why left ventricle wall thicker than right
Must pump blood to whole body, not just lungs
Number of heart chambers
Number of heart chambers
Four: two atria (upper) and two ventricles (lower)
Role of heart valves
Role of heart valves
Prevent backflow, ensure one-way circulation
Function of coronary arteries
Function of coronary arteries
Supply heart muscle with oxygenated blood
Natural resting heart rate
Natural resting heart rate
Around 70 beats per minute
Location of natural pacemaker
Location of natural pacemaker
Right atrium
Direction arteries carry blood
Direction arteries carry blood
Away from heart
Artery structural features
Artery structural features
Thick muscular walls, elastic fibres, high pressure
Direction veins carry blood
Direction veins carry blood
Towards heart
Vein structural features
Vein structural features
Wide lumen, low pressure, valves prevent backflow
Capillary wall thickness
Capillary wall thickness
One cell thick