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प्रश्न
You can see some blood vessels on the outside of the hands specially in older people. Are those veins or arteries? How can you confirm your answer?
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उत्तर
In older persons the skin becomes loose as the fat below becomes less with age and the vessels passing through these areas especially on the outside of the hands become prominent. These are veins as they flow superficially. The veins are thin and less muscular. These carry the blood to the heart veins are placed superficially so they are easily visible to the eye and are prominent.
The blood in the veins will be carrying CO2 and will have many substances like sugar, amino acids, chemicals and bacteria.
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संबंधित प्रश्न
The diagram below represents the human heart in one phase of its function. Study the diagram carefully and answer the questions that follow:
(i) Name the phase.
(ii) Which part of the heart is contracting in this phase? Give a reason to support your answer.
(iii) Name the parts labelled 1 to 4.
(iv) What type of blood flows through ‘2’?
(v) State the function of the part numbered ‘5’.
(vi) Name the membrane that covers the heart.
Give technical terms for The protective covering of the heart
Draw the structure of a human heart and label its parts.
Give reason for the following:
Blood flowing away from the stomach and intestines is put into circulation via the liver and
not directly.
What is haemoglobin? State the consequences of deficiency of haemoglobin in our bodies.
Explain the difference.
Arteries and veins.
Define the Arteries.
What are seen as greenish blue lines in our hands and legs?
The stomach is like a ______.
Name the following:
The structure that holds the heart valves in position.
