Advertisements
Advertisements
प्रश्न
Give reason for the following:
Only the veins and not the arteries are provided with valves.
Advertisements
उत्तर
Veins carry the blood from the body part towards the heart while the arteries carry the blood
from the heart. Veins carry the blood against the force of gravity. Therefore, only the veins
and not the arteries are provided with valves.
संबंधित प्रश्न
Why do people have a common belief that the heart is located on the left side of the chest?
The table below is designed to indicate the transport of certain substance in our body. Fill in the
blanks with suitable answers.
| Substance | From | To |
| Lungs | Whole body | |
| Carbon dioxide | ||
| Urea | ||
| Digested carbohydrates |
Intestines | |
| Target organs |
Give reason for the following:
The walls of the left ventricle are thicker than the walls of all other chambers.
Given diagram shows a simple diagram of the circulation of blood in a mamma showing the
main blood vessels, the heart, lungs and body tissues. The blood vessel, labelled 6, contains
deoxygenated blood and the valve leading to it has three semi-lunar pockets.
(a) Name the blood vessels and organs marked by numbers 1 to 8.
(b) What is meant by the term ‘double circulation’ of blood in mammals?
(c) what is diastole?
[There is an “error” in the diagram. According to the usual practice the pulmonary (lung)
circulation is shown upward and the systemic downward, but here it is reversed].
Why does the left ventricle possess a thicker wall than the right ventricle?
Fill in the blank:
______ carry pure blood.
Describe the functions of the: Heart
_____ gas is transported to all parts of the body.
What is the location of maturation of T-lymphocytes?
What are the normal values of blood pressure in a normal human adult?
