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प्रश्न
Describe in brief die cardiac cycle.
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उत्तर
Cardiac Cycle:
It is the sequential phenomenon of contraction and relaxation of the heart. The action potential causes atria and then ventricles to undergo contraction (systole) followed by their relaxation (diastole). Systole forces blood to move from the atria to the ventricles and to the pulmonary artery and the aorta, then. The heart beats 72 times in a minute. So several cardiac cycles are done per minute. The duration of the cardiac cycle is 0-8 seconds. Two heart sounds are heard by a stethoscope during each cardiac cycle.
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संबंधित प्रश्न
What is the the other name of 'high blood pressure'?
The human body has an organ A which acts as a double pump. The oxygenated blood coming from the lungs through blood vessel B enters the upper left chamber C of the double pump. When chamber C contracts, then blood goes into the lower left chamber D. The contraction of chamber D forces the blood to go into a blood vessel E which supplies oxygenated blood to all the organs of the body (except the lungs). The deoxygenated blood coming out of the body organs is taken by a blood vessel F to the right upper chamber G of the pumping organ. Contraction of chamber G forces the deoxygenated blood into the right lower chamber H. And finally, the contraction of chamber H sends the deoxygenated blood into the lungs through blood vessel I.
- What is organ A?
- Name the blood vessel (i) B (ii) E (iii) F, and (iv) I.
- What are chambers (i) C, and (ii) D?
- What are chambers (i) G and (ii) H?
Fill in the blank with suitable word given below:
The two lower chambers of the heart are called ___________.
Name any four heart conditions that occur commonly.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The heart of a normal human adult beats more than one lakh times per day.
The free edges of cuspid valves are attached to the papillary muscles of the heart by fibres are called ______.
How are arteries and veins structurally different from one another?
The given diagram represents the conducting system of human heart. Identify 1, 2, 3, 4.
Where is Bicuspid valve located? What is its function?
Note the relationship between the first two words and suggest a suitable word/words for the fourth place:
Lub : Atrioventricular valves :: Dup : ______
