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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 given below represents the human heart in one phase of its functions. Study the diagram carefully and answer the questions that follow:
- Name the phase.
- Which part of the heart is contracting in this phase? Give a reason to support your answer.
- Name the parts labelled 1 to 4.
- What type of blood flows through 2?
- State the function of the part numbered ‘5’.
- Name the membrane that covers the heart.
Give appropriate biological or technical terms for the following
The relaxation phase of the heart.
The cells in our blood which destroy disease-causing germs are ______.
Describe the circulatory system of humans.
Differentiate between members of the following pairs with reference to the aspect asked
within bracket:
Erythrocytes and leucocytes (function)
The oxygen-rich blood from the lungs comes into the ______ of the heart.
Why is circulatory system also known as transport system?
Blood is produced in the bone marrow.
Which of the following cells are produced from reticulocytes?
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Can you answer why the pulmonary artery shown in Fig. is blue in colour?
