
What is the life span of the platelets?

Important Questions on The Circulatory System
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 the name of the blood vessel in the case given below.
Several hours after a meal containing a lot of protein, which vessel will contain the highest concentration of urea?

Given below is a simple diagram of the circulation of blood in a mammal showing the main blood vessels, the heart, lungs and body tissues. The blood vessels, labelled 6, contain deoxygenated blood and the valve leading to it has three semi-lunar pockets.
Name the blood vessels or organs marked by numbers 1 to 8.


Draw a sectional view of the internal structure of the human heart and label the following parts and name them:
(i) Vein which brings deoxygenated blood from the upper part of the body.
(ii) Blood vessel which carries oxygenated blood to the body parts.
(iii) Chamber which pumps deoxygenated blood to the lungs.

Define the following term :
Bleeding.

The figure given is cross-sections of blood vessels:
Mention two structural differences between A and B.

Study diagram and answer:
Name the blood vessels labelled 1, 3, 6 and 7.

Given below is a simple diagram of the circulation of blood in a mammal showing the main blood vessels, the heart, lungs and body tissues. The blood vessels, labelled 6, contain deoxygenated blood and the valve leading to it has three semi-lunar pockets:
What is diastole?
