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aliina [53]
3 years ago
6

Sara was preparing for a biology lab that included using the light microscope. First Sara washed her hands. Then she picked up t

he microscope and carried it, holding the base, to her lab bench. She removed the cover and cleaned the lenses using lens paper. Finally, she plugged in the microscope light. Sara's teacher commented that Sara made one mistake when setting up her microscope. What was it?
Biology
2 answers:
klio [65]3 years ago
6 0

Answer:

Sara carried the microscope in a wrong way

Explanation:

Microscope is a device which is used to visualize microscopic materials in a magnified way. The magnification is available in variety of powers and can be chosen according to the requirement. Microscope is an expensive instrument and should be handled with utmost care. Therefore, it has an arm which is used while carrying it. To carry a microscope, one should always grab the base by one hand and the arm by other hand so that there is no scope of slipping.

miss Akunina [59]3 years ago
4 0
Sara should have held the microscope by the arm and the base, not just the base. That's the one mistake she made. 
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Buffers usually consist of a weak acid and its conjugate base; this enables them to readily absorb excess H+ or OH–, keeping the system’s pH within a narrow range.

Maintaining a constant blood pH is critical to a person’s well-being. The buffer that maintains the pH of human blood involves carbonic acid (H2CO3), bicarbonate ion (HCO3–), and carbon dioxide (CO2). When bicarbonate ions combine with free hydrogen ions and become carbonic acid, hydrogen ions are removed, moderating pH changes. Similarly, excess carbonic acid can be converted into carbon dioxide gas and exhaled through the lungs; this prevents too many free hydrogen ions from building up in the blood and dangerously reducing its pH; likewise, if too much OH– is introduced into the system, carbonic acid will combine with it to create bicarbonate, lowering the pH.
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ECF =Extra cellular fluid




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