Tina is a hard-working sales clerk in a busy department store.She has stood completely still behind the check-out counter for an 8-hour shift.At the end of Tina's shift she finds that she feels somewhat dizzy and guesses that her blood pressure is quite low.All of the following factors normally contribute to homeostatic blood pressure regulation.Which one is most likely contributing to her symptoms?

Question

Quizplus · Accepted Answer

Standing still for long periods of time can decrease the activity of the skeletal muscle pump, which normally helps to propel blood back to the heart, resulting in decreased blood pressure and potential dizziness. The increased activity of the pulmonary pump (B) and effective baroreceptor detection in the carotid artery (C) would normally contribute to maintaining homeostatic blood pressure, while increased sympathetic tone (D) would actually increase blood pressure. Therefore, out of the given options, only A is most likely contributing to Tina's symptoms.

Tina Is a Hard-Working Sales Clerk in a Busy Department