Biology
The diagram below represents the simplified pathway of the circulation of blood. Study the same and answer the questions that follow:
(i) Name the blood vessels labelled 1 and 2.
(ii) State the function of blood vessels labelled 5 and 8.
(iii) What is the importance of the blood vessel labelled 6?
(iv) Which blood vessel will contain a high amount of glucose and amino acids after a meal?
(v) Draw a diagram of the different blood cells as seen in a smear of human blood.
Circulatory System
ICSE 2014
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Answer
(i) The blood vessels labelled 1 and 2 are:
- 1 → Anterior / Superior venacava
- 2 → Dorsal aorta
(ii) Function of blood vessels —
- 5 → Supply oxygenated blood to liver.
- 8 → Carries deoxygenated blood from the posterior parts of the body to the right auricle of the heart.
(iii) Blood vessel 6 is called Hepatic portal vein. It carries deoxygenated blood from intestine to liver. This blood contains excess glucose, some toxic substances etc. which are sent to liver where they are detoxified and the excess glucose is converted to glycogen and stored. This prevents these substances from directly entering and damaging the heart.
(iv) Hepatic portal vein (i.e., blood vessel 6) contains a high amount of glucose and amino acids after a meal.
(v) Below diagram shows the different blood cells as seen in a smear of human blood:
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