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1) The composition of red blood cells have specialized protein called a. iron b. chlorophyll c. copper d. silver
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2) The transport system of blood by special organ heart constitutes a. circulatory system b. respiratory system c. digestion system d. nervous system
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3) The life span of red blood cells is a. 2 months b. 45 days c. 4 months d. 12 days
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4) Exhaled air is the air which we a. breath in b. breath out c. transport in body d. use under water
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5) The division of windpipe is done in two a. bronchioles b. alveoli c. nostril d. bronchi
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6) Blood collects oxygen from inhaled air and gives off carbon dioxide in the a. lungs b. liver c. kidneys d. heart
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7) Respiration which takes place in the absence of oxygen is called a. cellular respiration b. aerobic respiration c. anaerobic respiration d. breathing
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8) There is higher concentration of oxygen in a. inhaled air b. exhaled air c. circulated air d. deoxygenated air
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9) The distance which is travelled by an average red blood cell is equal to a. 1500km b. 1200km c. 2100km d. 5100km
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10) Heart is made of specialized a. cardiac muscles b. connective tissues c. both a and b d. skeletal sphincters
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11) Human beings have specialized structure to carry out exchange of gases called a. respiratory system b. digestion system c. nervous system d. circulatory system
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12) The blood which is oxygenated in lungs is carried to heart by a. pulmonary veins b. carotid veins c. aorta d. jugular vein
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