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प्रश्न
Explain the following:
Why is the SA node called the pace-maker of the heart?
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उत्तर
The SA is also called the pacemaker because it establishes the basic frequency at which the heart beats. It starts each heart beat and sets the pace for the whole heart.
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संबंधित प्रश्न
The blood leaving the tissues becomes richer in:
Multiple choice question. Tick (✓) the correct choice:
Human heart has
- one auricle and one ventricle.
- two auricles and one ventricle.
- two auricles and two ventricles.
- one auricle and two ventricles.
Match the terms given in column I with terms in Column II:
| Column I | Column Il |
| (i) Left-auricle | (a) Clotting |
| (ii) Right auricle | (b) Thebasius valve |
| (iii) Left ventricle | (c) Pulmonary vein |
| (iv) Right-ventricle | (d) Aorta |
| (v) Fibrin | (e) Pulmonary arch |
The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the questions that follow:
 |
- Name the phase.
- Which part of the heart is contracting in this phase? Give a reason to support your answer.
- Name the parts numbered 1to6.
- What type of blood flows through the parts marked 'l' and '2' respectively?
- How many valves are closed in this phase?
Explain the Term
Electrocardiogram (ECG)
Name the Following
Number of chambers present in the human heart.
State the Location: Semilunar valves of the heart
State the Function: Coronary artery
Which of the following acts as a pace setter of heart?
In the given figure of the heart which of the marked structures (1, 2, 3, 4, 5) carries oxygenated blood.
