Q. No.People living at sea level have around 5 million RBCs per cubic millimeter of their blood whereas those living at an altitude to 5400 metres have around 8 million. This is because at high altitude
| 1. | People eat more nutritive food, therefore, more RBCs are formed. |
| 2. | People get pollution-free air to breathe and more oxygen is available |
| 3. | Atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive. |
| 4. | There is more UV radiation which enhance RBC production. |
Subtopic: Human Heart: Cardiac Cycle |
89%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Origin of heart beat and its conduction is represented by
| 1. | AV bundle → Bundle of His → SA node → Purkinje fibres |
| 2. | SA node→ Purkinje fibres → AV node → Bundle of his |
| 3. | Purkinje fibres → AV node → Bundle of His → SA node |
| 4. | SA node → AV node → Bundle of His → Purkinje fibres |
Subtopic: Human Heart: Cardiac Cycle | Regulation of Cardiac Activity |
90%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when
| 1. | AV valves open up |
| 2. | Ventricular walls vibrate due to gushing in of blood from atria |
| 3. | Semilunar valves close down after the blood flows into vessels from ventricles |
| 4. | AV node receives the signal from SA node |
Subtopic: Human Heart: Cardiac Cycle |
92%
Level 1: 80%+
Hints
Subtopic: Human Heart: Cardiac Cycle |
91%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
The normal sequence of cardiac excitation in humans is:
| 1. | SA node → Bundle of His → AV node |
| 2. | AV node → SA node → Purkinje fibres |
| 3. | Purkinje fibres → Bundle of His → SA node |
| 4. | SA node → AV node → Bundle of His → Purkinje fibres |
Subtopic: Human Heart: Gross Anatomy | Human Heart: Cardiac Cycle |
94%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
The second heart sound (dubb) is associated with the closure of
1. tricuspid valve
2. semilunar valve
3. bicuspid valve
4. tricuspid and bicuspid valve
Subtopic: Human Heart: Cardiac Cycle |
91%
Level 1: 80%+
Hints
A patch of nodal tissue responsible for intiating the rhythmic contractile activity of heart is present in
1. Lower left corner of the left ventricle
2. Upper right corner of the right atrium
3. Lower left corner of the right ventricle
4. Upper left corner of the left atrium
1. Lower left corner of the left ventricle
2. Upper right corner of the right atrium
3. Lower left corner of the right ventricle
4. Upper left corner of the left atrium
Subtopic: Human Heart: Cardiac Cycle |
88%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Which of the following explains why veins have valves?
| 1. | To reduce the pressure in venous blood. |
| 2. | To maintain the oxygen concentration in venous blood. |
| 3. | To regulate the blood entering capillaries. |
| 4. | To prevent backflow of blood due to low pressure. |
Subtopic: Human Heart: Cardiac Cycle |
91%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Cardiac output in a normal adult at rest (heart rate = 72 beats/min; stroke volume = 70 mL) will be approximately:
| 1. | 8400 mL min⁻¹ | 2. | 144 mL min⁻¹ |
| 3. | 7200 mL min⁻¹ | 4. | 5040 mL min⁻¹ |
Subtopic: Human Heart: Cardiac Cycle |
89%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Which of the following is mismatched?
| 1. | Duration of a complete cardiac cycle | - | 0.8 seconds |
| 2. | Cardiac output in normal condition | - | 5040 mL/min |
| 3. | Cardiac output in strenuous condition | - | about 25 L/min |
| 4. | Normal heart beat | - | about 50 times/min |
Subtopic: Human Heart: Cardiac Cycle |
89%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
© 2026 GoodEd Technologies Pvt. Ltd.