A) renal
B) hepatic
C) double circulatory system
D) hypophysial
Correct Answer: D
Solution :
Hypophysial portal system is a minor portal system that occurs in higher vertebrates. The system consists of a single hypophysial portal vein which is formed by capillaries in hypothalamus. It passes into anterior lobe of pituitary gland and breaks up into capillaries there. Renal portal system occurs in lower vertebrates reduced in reptiles and aves and is absent in mammals. It consists of renal portal veins that bring blood from posterior part of body directly into kidney for removal of waste product. Hepatic portal system occurs in all vertebrates and is meant for taking blood from digestive tract, pancreas and spleen into liver. Double circulatory system consists of pulmonary circulation (movement of blood between heart and lung) and systemic circulation (movement of blood between heart and different part of body except lung).
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