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6.answer is Red cells contain a special protein called hemoglobin, which helps carry oxygen from the lungs to the rest of the body and then returns carbon dioxide from the body to the lungs so it can be exhaled. Blood appears red because of the large number of red blood cells, which get their color from the hemoglobin. 7.(i) answer is Arteries carry oxygenated blood away from the heart to the tissues, except for pulmonary arteries, which carry blood to the lungs for oxygenation (usually veins carry deoxygenated blood to the heart but the pulmonary veins carry oxygenated blood as well). There are two types of unique arteries.(ii) answer isPlatelets are only about 20% of the diameter of red blood cells. ... The principal function of platelets is to prevent bleeding. Red blood cells are the most numerous blood cell, about 5,000,000 per microliter. Red blood cells make up about 40% of our total blood volume, a measure called the hematocrit.
Explanation:
Answer:
6 . TO CARRY OXYGEN FROM OUR LUNGS TO REST OF THE BODY.
7. (I) PULMONARY ARTERY AND PULMONARY VEINS.
(II) TO STOP OUR BLOOD AND NOT TO FLOW WHEN WE GET A CUT.
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