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प्रश्न
Give reason:
Valves are present in the veins.
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उत्तर
- The main function of the valves in veins is to prevent backflow of blood.
- They are thin walled with semilunar valves to prevent backward flow of blood.
- Blood in the arteries, after being pumped by the heart, are under much higher pressure than blood in veins so there is no need for valves in arteries to prevent back flow.
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संबंधित प्रश्न
Which vein brings clean blood from the lungs into the heart?
Fill in the blank with suitable word given below:
The oxygen-rich blood from the lungs comes into the __________ of the heart.
Label the following diagram :
Give Technical Term for the following:
What is the approximate weight of the heart of a man?
Column 2 is a list of items related to ideas in Column 1. Match the term in Column 2 with the suitable idea given in Column 1.
| Column 1 | Column 2 |
| (i) Superior vena cava | (a) Collect deoxygenated blood from the wall of the heart. |
| (ii) Inferior vena cava | (b) Carry oxygenated blood to heart muscle. |
| (iii) Pulmonary vein | (c) Collects deoxygenated blood from upper part. |
| (iv) Coronary veins | (d) Collects deoxygenated blood from lower parts. |
| (v) Coronary artery | (e) Brings oxygenated blood from lungs. |
| (vi) Aorta | (f) Large artery |
| (vii) Heart attack | (g) Large vein |
| (viii) Blood Pressure | (h) Oxygenated blood |
| (ix) Tricuspid valve | (i) Sphygmomanometer |
| (x) Bicuspid valve | (j) Allows blood flow from right auricle to right ventricle. |
| (xi) Contraction and relaxation of heart | (k) Blocking of coronary arteries. |
| (l) Cardiac muscle. | |
| (m) Allows blood flow from left auricle to left ventricle. | |
| (n) Allows blood flow from right ventricle of pulmonary aorta. |
The free edges of cuspid valves are attached to the papillary muscles of the heart by fibres are called ______.
Complete the analogy.
The contraction of heart muscles: Systole:: Relaxation of heart muscles: ______.
In ____________ of a mammalian heart O2 rich blood enter first.
Draw a neat diagram of the conducting system of human heart and label AV node, Bundle of His and Purkinje fibres.
Explain the term Fossa ovalis.
