Haemoglobin is a type of :
Correct answer: B. Respiratory pigment
- A. Carbohydrate
- B. Respiratory pigment
- C. Vitamin
- D. Skin pigment
Explanation
Haemoglobin (Hb) is a conjugated protein. It consists of a basic protein globin joined to a nonprotein group heme. Heme is an ironporphyrin ring. A mammalian Hb molecule is a complex of 4 heme molecules joined with 4 globin molecules. It is present in RBC, and carries O 2 from the lungs to the tissues and transports CO 2 from the tissues to the lungs.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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