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प्रश्न
Answer in only one sentence of the following question:
Mention the role of the pacemaker in human heart.
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उत्तर
- The Sinu-auricular (SA) node is the pacemaker of the heart.
- It generates wave of contraction which spread along the wall of atria and bring about their contraction.
- It has highest degree of rhythmicity and is the first to originate the cardiac impulses and determine the rate of heart beat.
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संबंधित प्रश्न
Draw a diagram of the human heart and label its parts.
The diagram given alongside represents the human heart in one phase of its activity. Study the same and then answer the question that follow:
Name the phase.
The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the question that follow:
What type of blood flows through the parts marked '1' and '2'?
Heart is made up of ______.
In which of the following parts of human body are sweat glands absent?
Fill in the blanks of the following paragraph using just two words – arteries and veins.
___(a)___ carry oxygen-rich blood from the heart to all parts of the body and ___(b)___ carry carbon dioxide-rich blood from all parts of the body back to the heart. ___(c)___ have thin walls and ___(d)___ have thick elastic walls. Blood flows at high pressure in ___(e)___. Valves are present in ___(f)___ which allow blood to flow only towards the heart. ___(g)___ divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form ___(h)___.
In human foetus, the heart begins to beat at developmental age of
Give reason:
Pulmonary veins carry oxygenated blood.
When a person suffers from chest pain, the doctor immediately takes an ECG. Visit a doctor and get information about ECG. You may even look up an encyclopaedia or the internet.
Where is the following located?
Mitral valve
