An 81-year-old male patient who has a diagnosis of orthostatic ...

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An 81-year-old male patient who has a diagnosis of orthostatic hypotension is experiencing an episode of particularly low blood pressure.
 
  The man's body has responded by increasing levels of angiotensin II in the bloodstream, a hormone that decreases the glomerular filtration rate in the kidneys and contributes to an increase in blood pressure. Which of the following phenomena best describes what has occurred?
  A)
  Positive feedback
  B)
  Adaptation
  C)
  Negative feedback
  D)
  Homeostasis

Question 2

The mother of an 18-month-old child is concerned that her child is lethargic and is not eating foods that he normally enjoys. She takes him to the pediatrician for a check-up.
 
  Which of the following clinical manifestations would lead the health care provider to suspect the child may have a neuroblastoma? Select all that apply.
  A)
  Large protruding abdomen
  B)
  Excessive burping
  C)
  Weight loss
  D)
  Large amount of pale urine
  E)
  Crying when position is changed

[softEldritch]

Answer to Question 1

Ans:
C

Feedback:

his regulation and attempt to normalize blood pressure are an example of a negative feedback mechanism, in which physiological processes result in the maintenance of homeostasis. This process of normalization is not an example of positive feedback, and homeostasis is the goal rather than the process. This process involves adaptation, but negative feedback is a more precise characterization of the process.

Answer to Question 2

Ans:
A, C, E

Feedback:

Neuroblastomas are the second most common solid malignancy in childhood after brain tumors. Clinical manifestations vary with the primary site (usually the adrenal glands) and include large abdominal masses, fever, and possibly weight loss. Bone pain suggests metastatic disease.

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Excellent

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