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प्रश्न
The help of a well-labelled diagram describes the internal structure of the human heart.
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उत्तर
Human heart has four chambers, two atria and two ventricles.
Atria:
Right atrium:
- Two atria are separated by a septum. The right atrium receives deoxygenated blood from upper part of the body by superior vena cava and inferior vena cava collects blood from he lower part of the body. Coronary sinus brings blood from the heart muscles.
- Eustachian valve guards the opening of inferior vena cava while the besian valve is present near the opening of coronary sinus.
- A dperession called fossa ovails is present on the right side of interatrial septum.
- Right atrium opens into right ventricle.
Left atrium:
- Oxygeneated blood from lungs comes here via pulmonary veins.
- Left atrium opens into left ventricle.
Ventricles:
- Ventricles are the distributing chambers which are separated by interventricular septum.
- Left ventricle has thickest wall as it pumps blood to all parts of the body.
- In the opening of right atrium into right ventricle, tricuspid valve (three flaps) is present which controls the transportation of blood from right atrium to right ventricle. Similarly bicuspid valve is present in between left atrium and left venticle. It is also known as mitral valve.
- These valves are attached to the ventricle by chorac tendineae, which prevents the back flow of blood.
From right ventricle: Pulmonary trunk carries deoxygenated blood to lungs for oxygenation.
From left ventricle: The aorta distributes oxygenated blood to all parts of the body. Pulmonary aorta and systematic aorta have three semilunar valves at the base which prevents back flow of blood.
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संबंधित प्रश्न
Name of the valve between the left atrium and left ventricle and give its significance.
The figure below represents the internal structure of a mammalian heart and the associated blood vessels.
(i) (a) Name each of the structures labeled 1, 2, 3, 4, 5, 6, 7 and 8.
(b) State the function of each of the structures 5, 6, 7, and 8.
(ii) (a) State the function of the heart as an entire organ.
(b) Why are the walls of the left ventricle more muscular than the right?
Match the items given in Column I (Valves) with those in Column II (Location) and select the correct option.
| Column I | Column II | ||
| i. | Tricuspid valve | a. | Between left atrium and left ventricle |
| ii. | Bicuspid valve | b. | Between right ventricle . and pulmonary artery. |
| iii. | Semilunar valve | c. | Between right atrium and right ventricle |
______ guards the opening of inferior vena cava.
Identify the INCORRECT statement regarding heart.
In ____________ of a mammalian heart O2 rich blood enter first.
Identify the CORRECT route through which impulse travels in the heart.
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)___.
Draw the neat Labelled diagram of the internal structure of the human heart.
Give reason:
Pulmonary veins carry oxygenated blood.
