Hemoglobin readily combines with oxygen to form:
Correct answer: A. Bright red oxyhemoglobin
- A. Bright red oxyhemoglobin
- B. Purple red oxyhemoglobin
- C. Bright red hemoglobin
- D. Purple red hemoglobin
Explanation
Hemoglobin readily combines with oxygen to form "oxyhemoglobin." Oxyhemoglobin is the complex that is formed when oxygen molecules bind to the iron atoms in the heme groups of the hemoglobin molecules present in red blood cells. This binding of oxygen to hemoglobin enables the transportation of oxygen from the lungs, where there's a higher partial pressure of oxygen, to the body's tissues, where oxygen is needed for cellular respiration. The formation of oxyhemoglobin is reversible, allowing oxygen to be released from hemoglobin and delivered to tissues that require it.
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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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