Answer is C. By exposure to mucous membranes of an infected person
Blood borne pathogens are microorganisms which are transmitted through the blood. Blood borne infections can be transmitted in the blood or body fluid such as saliva, mucus that can be mixed with blood and cause diseases like Hepatitis B and HIV (Human immuno deficiency virus). The most common method of transmission of pathogen through blood of an infected person when enters in the body of a healthy person through open wound.
Yes you should. They would know what to do
At the onset of a muscle contraction, the presence of calcium triggers the opening of the Na-K channels in the membrane. Potassium is a calcium inhibitor, so as the potassium flows out of the cell, it eventually reduces the presence of calcium. This causes the closure of the Na-K channel (negative feedback mechanism). In a hypokalemic state, the lack of sufficient K doesn't inhibit the calcium channel, and in turn doesn't properly terminate the muscle contraction at the cellular level.
The answer is D. Ignore threats from the cyberbully.
The best way to deal with cyberbullies is to just ignore them, do not respond to them as this is what they want, the attention, the glory. You should always tell an adult you trust for example your parents about any cyberbullying, you should not keep it to yourself as this can be dangerous. It would be sensible to save all the evidence but as far as this question goes the best answer is D.
