(I) Name the respiratory pigment in human beings.

Hi, I have a question and I hope anyone could answer it:

(I) Name the respiratory pigment in human beings. 

(II) Write the functions of capillaries.

1 Answer

  1. (I) In human beings (the vertebrates), the respiratory pigment is haemoglobin, contained in the erythrocytes (red blood cells).

    (II) Capillaries, the smallest and most numerous of the blood vessels, form the connection between the vessels that carry blood away from the heart(arteries) and the vessels that return blood to the heart(veins). The primary function of capillaries is the exchange of materials between the blood and tissue cells.

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