The diagram given here is the standard ECG of a normal person. The P-wave represents the:
Correct answer: C. Contraction of both the atria
- A. Beginning of the systole
- B. End of systole
- C. Contraction of both the atria
- D. Initiation of the ventricular contraction
Explanation
P-wave represents the electrical excitation (or depolarisation) of the atria, which leads to the contraction of both the atria. The QRS complex represents the depolarisation of the ventricles, which initiates the ventricular contraction. The contraction starts shortly after Q and marks the beginning of the systole. The T wave represents the return of the ventricles from excited to normal state. (repolarisation). The end of the T-wave marks the end of systole.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Circulation
The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
Practise Circulation
695 free Circulation MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Circulation questions
The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the label and give its functions?
Blood pressure in the mammalian aorta is maximum during:
Which one of the following animals has two separate circulatory pathways?
The figure shows blood circulation in humans with labels A to D. Select the option which gives correct identification of label and functions of the part.
The figure shows a human blood cell. Identify it and give its characteristics.
Which one of the following plasma proteins is involved in the coagulation of blood?