CAIE A-Level Biology AS 8.3.1 Mammalian Heart Structure Questions
Describe mammalian heart chambers, valves and functions using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- AS
Exam points
- Describe the structure of the mammalian heart and the functions of its chambers and valves.
CAIE A-Level Biology AS 8.3.1 Mammalian Heart Structure Questions question 1
[Maximum number: 1]
Control of heartbeat is myogenic. This means the electrical activity controlling the rhythm of a regular heartbeat begins in the heart muscle itself.
Atrial fibrillation (AF) is an abnormal heart rhythm that causes rapid and irregular contractions of the atria. Untreated cases of AF can lead to a stroke.
A stroke is caused when a small blood clot, often forming in the left atrium, is carried by the blood to the brain where it blocks a small artery and leads to brain damage.
List all of the structures through which a blood clot in the left atrium must travel to reach the blood vessels supplying the brain.
The structures must be listed in the correct sequence.
mitral / bicuspid / atrioventricular, valve
and
left ventricle
and
semilunar / aortic, valve
and
aorta ;
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