If a sea star egg is taken from the ocean and put into Lake Michigan, would you expect the egg to shrink, swell, or stay the same size?
Stay the same size
None of the above
Swell
Shrink
The Correct Answer is C
Choice A reason: The egg would not stay the same size, as ocean water is hypertonic (higher salinity) compared to Lake Michigan’s fresh water. Osmotic differences drive water movement into the egg, causing swelling, making this an incorrect prediction.
Choice B reason: “None of the above” is incorrect, as the egg will swell due to osmosis. Fresh water in Lake Michigan has lower solute concentration than the egg’s cytoplasm, causing water influx, making this an invalid choice.
Choice C reason: The sea star egg will swell in Lake Michigan’s fresh water, which is hypotonic to the egg’s hypertonic cytoplasm. Water moves into the egg via osmosis, increasing its volume, making this the correct prediction for the egg’s response.
Choice D reason: The egg would shrink in a hypertonic environment, like concentrated saltwater, not fresh water. Lake Michigan’s hypotonic fresh water causes water influx, not loss, making shrinking an incorrect outcome for the egg.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: Rapid mood swings are characteristic of bipolar disorder, not OCD. OCD involves intrusive thoughts and compulsive behaviors, like Marty’s hand washing, so this is incorrect for OCD’s primary feature.
Choice B reason: Social withdrawal is more typical of depression or schizophrenia, not OCD. Marty’s persistent thoughts and rituals define OCD, making this incorrect for the disorder’s main characteristic.
Choice C reason: OCD is defined by persistent, unwanted thoughts (obsessions) and repetitive behaviors (compulsions), as seen in Marty’s germ fears and hand washing. This is the correct primary characteristic of OCD.
Choice D reason: Hallucinations and delusions are associated with psychotic disorders, not OCD. Marty’s intrusive thoughts and rituals are classic OCD symptoms, so this is incorrect for the primary feature.
Correct Answer is D
Explanation
Choice A reason: Retching is the involuntary attempt to vomit, involving abdominal muscle contractions without expelling stomach contents. The patient is actively expelling contents, which defines vomiting, not just the effort of retching, making this an incorrect term for documentation.
Choice B reason: Expectorate refers to coughing up and spitting out mucus or sputum from the respiratory tract. The patient is expelling stomach contents, not respiratory secretions, making expectorate an incorrect term for this gastrointestinal event.
Choice C reason: Regurgitation is the passive return of undigested food or liquid from the stomach or esophagus, often without force. The forceful expulsion of stomach contents described indicates vomiting, not regurgitation, making this an incorrect documentation term.
Choice D reason: Vomiting is the forceful expulsion of stomach contents through the mouth, driven by coordinated abdominal and diaphragmatic contractions. The patient’s active expulsion into a basin matches this definition, making vomiting the correct term for documentation.
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