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Biology A Level > The Heart > Flashcards

The Heart Flashcards

1
Q

What vessel supplies oxygenated blood to the heart muscle?

A

Coronary arteries on the surface

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2
Q

Heart muscle

Is… which means it …

A

Cardiac muscle

Myogenic
Initiates own contractions

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3
Q

What prevents valves from turning inside out?

A

Tendinous cords attached to valves

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4
Q

Fibrillation

A

Uncoordinated contraction of atria or ventricles

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5
Q

SAN (sino-atrial node)

A

Heart’s pacemaker
Generates electrical activity
Initiates wave of excitation over walls and causes cardiac muscle to contract (atrial systole)

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6
Q

AVN (atrio-ventricular node)

Which is…

A

Conducts wave of excitation through ventricles

Delayed to allow time for atria to finish contracting

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7
Q

Fast heart rate

A

Tachycardia

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8
Q

Slow heart rate

A

Bradycardia

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9
Q

Atria more frequently beats than ventricles

A

Atrial fibrillation

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10
Q

3rd beat is an early ventricular

A

Ectopic heartbeat

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Biology A Level (28 decks)

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