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 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 | |||
Which of the following are correct ? (a) Human heart consists of basically four chambers. The upper chamber are called the auricle or the atrium and the lower two chamber are called the ventricles. (b) The two auricles are separated from each other by interauricular septum and the two ventricles are separated by interventricular septum. (c) The ventricle have more muscular wall than the auricles. The right auricle opens into the right ventricle . This opening is guarded by a tricupsid valve. | |||
| Right Option : D | |||
| View Explanation | |||
How many chambers are present in the human heart? | |||
| Right Option : D | |||
| View Explanation | |||
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