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GCSE Biology AQA
Paper 1
Heart
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Keren Debrah
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Cards (23)
What is the role of the circulatory system?
To transport
oxygen
and
nutrients
to the body's tissues
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What are the three main components of the circulatory system?
Blood,
blood vessels
, and the
heart
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How does the heart function in the circulatory system?
The heart pumps blood to keep it moving through the
vessels
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What is the structure of the circulatory system?
Composed of blood,
blood vessels
, and the
heart
Blood carries
oxygen
and nutrients
Blood vessels hold blood
Heart pumps blood
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What is meant by a double circulatory system?
It has two
distinct loops
for blood circulation
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What are the two loops in the double circulatory system?
One carries
deoxygenated
blood to the
lungs
, and the other carries oxygenated blood to the body
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What happens to blood in the lungs?
It gains oxygen and becomes
oxygenated
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How many chambers does the heart have?
Four
chambers
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What are the top chambers of the heart called?
Atria
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What are the bottom chambers of the heart called?
Ventricles
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What is the function of the valves in the heart?
To prevent blood from flowing
backwards
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Describe the path blood takes through the heart.
Blood enters via the
vena cava
and
pulmonary vein
Flows into the right atrium and left atrium
Atria
contract, pushing blood into
ventricles
Ventricles contract, pushing blood into
pulmonary artery
and
aorta
Cycle repeats
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How often does the heart cycle repeat?
About
70
times a minute
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What is the role of pacemaker cells in the heart?
They produce
electrical
impulses to regulate heart contractions
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What is an artificial pacemaker used for?
To regulate heart contractions when
natural pacemaker cells
fail
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What distinguishes arteries from veins?
Arteries carry blood away from the
heart
, while veins carry blood to the heart
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Can arteries carry deoxygenated blood?
Yes, the
pulmonary artery
carries deoxygenated blood
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Can veins carry oxygenated blood?
Yes, the
pulmonary vein
carries oxygenated blood
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What are coronary arteries?
Small arteries that supply oxygenated blood to the heart muscle
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What is the importance of coronary arteries?
Supply
oxygen
and nutrients to
heart muscle
Ensure proper heart function
Prevent heart tissue damage
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What type of walls surround the chambers of the heart?
Thick
muscular
walls
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How is the orientation of the heart represented in diagrams?
The
left
side is on our right and the
right
side is on our left
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Why does the heart need its own supply of oxygenated blood?
To ensure the
muscle tissue
gets all the oxygen and nutrients it needs
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