MCQ
Pick the odd one out.
- ✓Atrial systole: ventricular systole
- BVentricular systole: atrial diastole
- CPacemaker: SA node
- DPortal vein: capillaries
✓
Answer
Correct option: A.
Atrial systole: ventricular systole
(a) Atrial systole: ventricular systole
Explanation:
The two main phases of heartbeat are atrial systole and ventricular systole.
Contraction of the two atria (atrial systole) is always accompanied by ventricular diastole to allow blood to enter ventricle.
Contraction of ventricle (ventricular systole) is followed by atrial diastole. When ventricles contract and atria relax, the blood tend to enter atria which is prevented by bicuspid and tricuspid valves.Sinoatrial node is commonly called as pacemaker. Heartbeat arises in SA node. It is located in the walls of right auricle.
Explanation:
The two main phases of heartbeat are atrial systole and ventricular systole.
Contraction of the two atria (atrial systole) is always accompanied by ventricular diastole to allow blood to enter ventricle.
Contraction of ventricle (ventricular systole) is followed by atrial diastole. When ventricles contract and atria relax, the blood tend to enter atria which is prevented by bicuspid and tricuspid valves.Sinoatrial node is commonly called as pacemaker. Heartbeat arises in SA node. It is located in the walls of right auricle.
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