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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
Multiple choice question. Tick (✓) the correct choice:
The heartbeat is measured by an instrument called
- thermometer
- sphygmomanometer
- stethoscope
- none of the above
Select the odd one in the following:
Artery, Vein, Capillary, Nerve.
State the Location: Sino-auricular node
State the Function: Semilunar valves of the heart
Pick out the odd one.
heart, legs, brain, kidney
Name the heart valve associated with the major arteries leaving the ventricles.
The correct match of blood vessel, its connection and O2 content is ____________.
The heart is surrounded by a double-layered membrane called ______.
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)___.
When a person suffers from chest pain, the doctor immediately takes an ECG. Visit a doctor and get information about ECG. You may even look up an encyclopaedia or the internet.
