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As you travel up a mountain in your car, you notice that your hearing diminishes. You realize that your ears are stopping up, and you swallow several time to clear them. Why does this happen? A) your tympanic membrane gets washed off by your saliva. B) swallowing equalizes the pressure […]

Some individuals who are depressed have an abnormally small amount of the neurotransmitter serotonin at certain synapses in the brain.  One category of antidepressant drugs is called selective serotonin reuptake inhibitors.  Can you deduce what action this drug has at a synapse to increase the amount of serotonin present in […]

In our reading this week, we learned more about some of the philosophers’ perspectives on how to cultivate that fertile ground for engaging in meaningful friendships. Many philosophers seem to agree that friendship is not about being knowledgeable or following a specific prescription for being a true friend. Vernon’s summary […]

The plasma membrane acts as a barrier in cells of all types to control the movement of substances into and out of the cell. a) Explain how the plasma membrane acts as a semi-permeable barrier to various types of molecules based on its molecular structure. b) Describe, in detail, three […]