Which hormone is secreted in response to low levels of calcium in the bloodstream?
Thyroid hormone
Parathyroid hormone
Calcitonin
Vasopressin
The Correct Answer is B
Parathyroid hormone (PTH) is a hormone produced by the parathyroid glands, which are located behind the thyroid gland in the neck. PTH regulates the calcium levels in the blood by stimulating the release of calcium from the bones, increasing the absorption of calcium from the intestines, and decreasing the excretion of calcium from the kidneys. When the calcium levels in the blood are low, PTH is secreted to raise them back to normal.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Infectious mononucleosis, also known as mono or the kissing disease, is an upper respiratory tract infection caused by the Epstein-Barr virus (EBV). EBV is a member of the herpesvirus family and can be transmitted through saliva or blood. The infection typically affects the lymph nodes, tonsils, and pharynx, causing symptoms such as fever, sore throat, swollen glands, and fatigue. The infection usually resolves on its own within a few weeks, but some people may experience complications such as splenomegaly, hepatitis, or neurological disorders. The diagnosis of infectious mononucleosis can be confirmed by a blood test that detects antibodies to EBV or by a mono-spot test that detects heterophile antibodies. A patient has been diagnosed with COPD (chronic obstructive pulmonary disease).
Correct Answer is D
Explanation
More H and HCO3 form, decreasing the blood's pH.
Rationale: Hypoventilation is a condition where the breathing rate is too slow or shallow, resulting in insufficient removal of carbon dioxide (CO2) from the body. CO2 reacts with water (H2O) to form carbonic acid (H2CO3), which can dissociate into hydrogen ions (H+) and bicarbonate ions (HCO3-). Therefore, when CO2 accumulates in the blood due to hypoventilation, more H2CO3 is formed, which lowers the blood's pH by increasing the concentration of H+ and HCO3-.
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