It is everyones duty to do someting good to the environment around us.As middle school students, we can also do a lot of helpful things.For example, we can protect it by not throwing rubbish away.We can save water to make full use of it. We can use materials which do no harm to t...
1)Across cell membranes, oxygen and carbon dioxide move or transport via simple diffusion, and no...
Human blood is designed to capture oxygen and safely bind it to a molecule known as hemoglobin. However, if you breathe in a high concentration of oxygen, it will overwhelm the blood, disrupting the central nervous system, damaging the lungs, heart and brain. How much oxygen do we inhale ...
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All the while, your mammalian dive response causes your body to do the opposite of what happens on land when you hold your breath for a long time: your heart rate slows, even as the oxygen level in your blood drops. To make up for the oxygen loss to vital organs, blood rushes from ...
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As teachers we feel the need to do more than merely teach basic facts and concepts. We want to make the subject matter more relevant; we would like to help integrate the various threads of the students' education and life experiences; and, finally, we wish to increase the students' interes...
Like most animals, roundworms primarily engage in aerobic respiration, meaning that they use oxygen to convert food into energy. However, roundworms do not use lungs to move the oxygen around their bodies. Roundworms absorb oxygen and release carbon dioxide directly through their cuticle, which is...
While piranhas aren't quite the vicious man-eaters of myth, attacks on humans have been increasing in frequency. In South America, people have been losing fingers and toes more often than they were just 10 years ago, and experts believe it might have something to do with an increase in th...
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