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Question
Describe the flow of blood through the heart of human beings.
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Solution
Flow of blood through heart -
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Deoxygenated blood from different organs comes to the right atrium through the vena cava.
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From the right atrium, blood goes to the right ventricle. The tricuspid valve between the right atrium and right ventricle prevents the backflow of blood.
- From the right ventricle, blood goes to the lungs through the pulmonary artery. Inside the lungs, carbon dioxide is removed from the blood and oxygen enters the blood.
- From the lungs, blood goes to the left atrium through the pulmonary vein.
- From the left atrium, blood goes to the left ventricle.
- From the left ventricle, blood is pumped into the aorta so that it can be supplied to different organs.
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Multiple Choice Questions
The beating of the heart of man is heart on the left side, because:
Give scientific reason.
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What does the QRS - complex represent?
For which of the following reason the left ventricle of human heart has its wall thicker than the right ventricle?
How many times per healthy man beats?
The given diagram represents the conducting system of human heart. Identify 1, 2, 3, 4.
The inner surface of the ventricle is thrown into series of irregular muscular ridges called ______
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)___.
Heart sound 'dub' is caused due to closing of ______.
Give the meaning of pacemaker.
Give reason:
Pulmonary veins carry oxygenated blood.
The doubled-layered membrane which covers and protects the heart is ______.
Note the relationship between the first two words and suggest a suitable word/words for the fourth place:
Lub : Atrioventricular valves :: Dup : ______
