class10............science
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a.The majority of mammals (including humans) utilize a double circulatory system. This means we have two loops in our body in which blood circulates. One is oxygenated, meaning oxygen rich, and the other is deoxygenated, which means it has little to no oxygen, but a lot of carbon dioxide.
b. The inner lining of nostril is lined by nasal hair and remains wet due to mucus secretion. When air passes through the nasal passage, the nasal hair and mucus trap the dust particles and other impurities present in the inhaled air. Thus, clean air goes into the lungs
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Answer:
a) The process of flowing blood from heart twice making one complete round through the body is called double circulation.
b) A mucous membrane lines up in our nasal cavity and it helps keep our nose moist. Small hairs present inside our nose help to filter the air which we breathe in, block dirt and dust from getting into our lungs.
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