The hormone that stimulates milk ejection during breastfeeding is:
A. Prolactin
B. Estrogen
C. Progesterone
D. Oxytocin
Answer: Option D
Solution (By JKSSB Mock Tests)
Oxytocin, released from the posterior pituitary in response to suckling, causes contraction of myoepithelial cells around mammary alveoli, forcing milk into ducts (let-down reflex). Prolactin stimulates milk synthesis. Estrogen and progesterone inhibit milk secretion during pregnancy.
Explanation:
AB positive blood has both A and B antigens and the Rh antigen, so it lacks antibodies against A, B, or Rh. Hence, individuals with AB+ can receive red blood cells from any donor without agglutination. O negative is the universal donor. Compatibility depends on antigens on donor RBCs and antibodies in recipient plasma.
Explanation:
The gall bladder is a small sac under the liver that stores and concentrates bile produced by the liver, releasing it into the duodenum when needed for fat digestion. The liver makes bile, pancreas produces digestive enzymes, duodenum is the entry point.
Explanation:
Veins have thinner walls and larger lumens; arteries are thick and elastic; capillaries are thin for exchange; venules are larger than capillaries. Valves are in veins.
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