The Heart and Cardiac Activity (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Why does the heart require its own coronary circulation?
Why does the heart require its own coronary circulation?
Heart wall too thick for O₂ diffusion
Which blood vessel carries deoxygenated blood from the right ventricle to the lungs?
Which blood vessel carries deoxygenated blood from the right ventricle to the lungs?
Pulmonary artery
What is the primary function of the septum in the heart?
What is the primary function of the septum in the heart?
Prevents mixing of oxygenated/deoxygenated
Why does the left ventricle have a thicker muscular wall than the right ventricle?
Why does the left ventricle have a thicker muscular wall than the right ventricle?
Pumps blood throughout entire body
What is the function of valve tendons (chordae tendineae)?
What is the function of valve tendons (chordae tendineae)?
Prevent valve flaps inverting under pressure
What does the term 'systole' refer to in the cardiac cycle?
What does the term 'systole' refer to in the cardiac cycle?
Contraction phase
What causes heart valves to open and close?
What causes heart valves to open and close?
Pressure differences across the valve
What does it mean that the heart is 'myogenic'?
What does it mean that the heart is 'myogenic'?
Can initiate own contractions internally
Which structure acts as the heart's natural pacemaker?
Which structure acts as the heart's natural pacemaker?
SA node
What does the P wave on an ECG represent?
What does the P wave on an ECG represent?
Atrial depolarisation