In the Physio experiment on thyroid gland activity, which rat developed a goiter/mass?
Hypophysectomized rat treated with thyroxine
Hypophysectomized rat treated with TSH
Thyrodectomized rat treated with PTU
Thyrodectomized rat treated with TSH
The Correct Answer is B
a) Hypophysectomized rat treated with thyroxine: Thyroxine suppresses TSH; no goiter forms.
b) Hypophysectomized rat treated with TSH: TSH directly stimulates thyroid tissue growth, leading to goiter even if the pituitary is absent.
c) Thyroidectomized rat treated with PTU: No thyroid = no goiter can form, and PTU inhibits thyroid hormone production, not causing growth in absent tissue.
d) Thyroidectomized rat treated with TSH: Without thyroid tissue, TSH has no target to stimulate.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B,D,C,A
No explanation
Correct Answer is B
Explanation
a) Thalamus: Relay center for sensory signals, not involved in hormone secretion.
b) Hypothalamus: Releases releasing and inhibiting hormones (e.g., TRH, GnRH, CRH) that regulate the anterior pituitary's activity.
c) Basal ganglia: Involved in motor control, not endocrine regulation.
d) Spinal cord: Transmits nerve signals; no role in endocrine control of the pituitary.
e) Hippocampus:Acrucial brain structure involved inmemory formation, spatial navigation, and emotional regulation.
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