When the ovaries secrete estrogen in response to the hormone GnRH, this is an example of
Hormonal
Neural
Negative Feedback
Humoral
The Correct Answer is A
a) Hormonal: This refers to the stimulation of one endocrine gland by hormones released from another gland. GnRH from the hypothalamus stimulates the anterior pituitary to release LH/FSH, which then stimulate the ovaries to secrete estrogen. Thus, this is hormonal control.
b) Neural: Neural stimulation involves direct innervation (e.g., adrenal medulla stimulated by the sympathetic nervous system), which does not apply here.
c) Negative Feedback: This refers to a regulatory mechanism, not the initial cause of estrogen secretion. Estrogen can negatively feedback on GnRH, but that’s not the mechanism being asked.
d) Humoral: Humoral stimuli refer to changes in blood levels of ions or nutrients (e.g., calcium regulating PTH), not hormones.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
a) Is the body's immediate response to a real or perceived threat to survival: This defines the fight-or-flight response.
b) Elevates heart and respiration rates and blood glucose level: These are physiological responses to increase energy and oxygen delivery.
c) Decreases urinary and digestive functions: These are temporarily suppressed to prioritize critical functions.
d) All of these are correct: This includes all the listed accurate physiological responses.
Correct Answer is B
Explanation
a) Low level of iron concentration in the blood: Iron is necessary for hemoglobin synthesis, but it does not directly stimulate EPO production.
b) Low level of oxygen concentration in the blood: Hypoxia is the primary stimulus for EPO release, which then promotes red blood cell production to increase oxygen-carrying capacity.
c) Low number of red blood cells in the blood: While anemia can lead to hypoxia, it is the oxygen deficit (not RBC count itself) that directly stimulates EPO.
d) High number of red blood cells in the blood: This would decrease EPO production through negative feedback.
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