Heart Pumping Organ
Heart Pumping Organ
Human heart is a muscular, cone shaped , hollow dark red colour organ about the size of fist .It plays the role of pump in the circulatory system. Heart is situated behind the sternum, between the lungs in the thoracic cavity. The heart is slightly tilted towards the left. In man heart weighs 0.43 % of the body weight .
The heart is covered in the tough inflexible membrane called as pericardium. Between heart and the pericardium their is present pericardial fluid which help to reduce friction between the heart wall and surrounding tissue. The heart is made up of special types of muscles called as myocardium. The inner lining of heart is called as endothecium.
Internal Structure of Human Heart :
Heart consists of different types of vessels like :-
Working of Heart :-
Which of the following are correct ? (a) Heart is the pumping organ of our respiratory system. (b) The heart is located, slightly towards the left, in the chest. It is a muscular organ roughly of the size of the closed fist of the person. (c) The heart is divided into two equal halves - left half and right half. Each half is further divided into two chambers which have a common opening between them. There are, thus, four chambers in all.
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| Right Option : B | |||
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The main function of the heart is to pump __________________ and keep it moving in the blood vessels.
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| Right Option : A | |||
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Which of the following are correct about heart? (a) The upper two chambers are called auricles, or atrium and the lower two chambers are called ventricles. The left auricle (atrium), and left ventricle, contain oxygen rich blood. (b) The right auricle (atrium), and the right ventricle, contain blood having carbon dioxide in it. (c) The main function of the heart is to pump blood and keep it moving in the blood vessels. | |||
| Right Option : D | |||
| View Explanation | |||
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