Same chapter3 marksDifficulty: Medium
What is the coagulation of blood and what is the role of platelets in it?
Body Fluids and Circulation
3 marksDifficulty: Medium
Describe the conducting system of the human heart.
Original Khojo Papers practice question — not from a past board paper.
Answer
The sino-atrial node in the right atrium generates the impulse and is the pacemaker. The impulse spreads over both atria and reaches the atrio-ventricular node, which delays it briefly, and passes down the bundle of His into the two branches and then through the Purkinje fibres to the ventricular muscle, so the ventricles contract from the apex upwards.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The delay at the AV node lets the atria empty before the ventricles contract.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
What is an electrocardiogram, and what do the P wave, the QRS complex and the T wave represent?
Body Fluids and Circulation
Same chapter3 marksDifficulty: Medium
Describe the cardiac cycle in outline and state its duration.
Body Fluids and Circulation
Same subject3 marksDifficulty: Medium
State three differences between gymnosperms and angiosperms.
Plant Kingdom
Same subject3 marksDifficulty: Medium
State three characteristics of bryophytes and name one example.
Plant Kingdom
Same subject3 marksDifficulty: Medium
What are viruses, and why are they placed outside the five-kingdom system?
The Living World and Biological Classification