Consider the following statements about the liver: 1. It stores glycogen. 2. It secretes bile. 3. It produces insulin. Which of the above is/are correct? MCQ with Answer and Explanation
Consider the following statements about the liver:
1. It stores glycogen.
2. It secretes bile.
3. It produces insulin.
Which of the above is/are correct?
A. 2 and 3 only
B. 1 and 2 only
C. 1 and 3 only
D. 1, 2, and 3
Answer: Option B
Solution (By JKSSB Mock Tests)
The liver stores glycogen and produces bile. Insulin is produced by the beta cells of the pancreas. So 3 is incorrect.
The hormone aldosterone, which acts on the distal convoluted tubule and collecting duct to increase sodium reabsorption and potassium excretion, is secreted by the:
Explanation:
Aldosterone is a mineralocorticoid hormone secreted by the zona glomerulosa, the outermost layer of the adrenal cortex. Its primary function is to regulate electrolyte balance by promoting the active reabsorption of sodium (Na+) and the excretion of potassium (K+) and hydrogen ions (H+) in the distal tubules and collecting ducts of the kidneys. The zona fasciculata secretes glucocorticoids (cortisol).
Explanation:
Calcitonin, secreted by parafollicular (C) cells of the thyroid, decreases blood calcium by inhibiting osteoclasts and promoting calcium deposition in bones. Parathyroid hormone (PTH) raises calcium.
Consider statements about human nutrition: 1. Calcium is essential for blood clotting. 2. Iron is a component of hemoglobin. 3. Iodine is required for thyroid hormone synthesis. Which are correct?
Explanation:
Calcium ions (Ca2+) are essential cofactors in the blood coagulation cascade, required for converting prothrombin to thrombin. Iron is the central atom in the heme group of hemoglobin, enabling oxygen transport in red blood cells. Iodine is an indispensable component of the thyroid hormones thyroxine (T4) and triiodothyronine (T3). All three statements are biologically accurate.
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