Advertisements
Advertisements
प्रश्न
Give scientific reason.
Arteries are thicker than veins.
Advertisements
उत्तर
- Arteries carry oxygenated blood away from the heart to the body.
- The blood pumped out by the heart is under high pressure and to withstand this pressure arteries are thick-walled.
- Veins carry deoxygenated blood from the body back to the heart.
- They are thin-walled as the blood that flows through veins is under low pressure. Hence, arteries are thicker than veins.
- Veins, on the other hand, have thinner walls and a bigger lumen since they do not need to resist high pressure like arteries.
- Furthermore, because veins convey relatively low-pressure blood, they are frequently fitted with valves to promote unidirectional blood flow towards the heart.
APPEARS IN
संबंधित प्रश्न
Put a tick mark (✓) against the correct alternative in the following statement:
The blood tastes saltish due to the presence of dissolved:
- Sodium chloride
- Potassium chloride
- Ammonium nitrate
- Sodium nitrate
What is the role of haemoglobin in the blood ?
Fill in the blank.
The red-coloured pigment present in RBCs is called __________.
Which of the following statement is true (T) and which ones are false (F)? Mark T or F:
Blood group A has antigen A.
Differentiate between arteries and veins.
The following simplified diagram refers to the outline plan of the circulation of blood in a mammal. Study the diagram and write the number and name of the blood vessel in each case as mentioned ahead.
Which vessel would contain the highest concentration of amino acids and glucose soon after a meal?
Given below is a diagrammatic representation of certain types of blood vessels in human body.
Where can such an arrangement be found as an example - in lungs or in heart walls?
The circulatory system is made up of the heart, blood, and blood vessels.
Why do arteries have thick and elastic walls whereas veins have valves?
Given alongside are diagrams of a certain category of blood vessels showing the role of a special structure in their walls. Study the figure and answer the questions that follow.
 |
- Name the kind of blood vessels shown in the figure. What are its branches termed as?
- Name the structure shown inside the blood vessels. Write its important role.
- What kind of blood flows through these blood vessels normally? Name the blood vessel which carries blood from the heart to the lungs.
- Name a similar kind of blood vessel which is related to the liver and kidney.
- Draw a neat and labelled diagram of the transverse section of the blood vessel shown above showing the three layers of its wall and lumen.
