The organ that stores and concentrates bile is the:
A. Duodenum
B. Pancreas
C. Liver
D. Gall bladder
Answer: Option D
Solution (By JKSSB Mock Tests)
The gall bladder, a small pear-shaped sac under the liver, stores and concentrates bile produced by the liver, releasing it into the duodenum in response to cholecystokinin (CCK). The liver makes bile, pancreas secretes enzymes, duodenum is the entry point.
Explanation:
The placenta is a vascular organ formed from fetal chorion and maternal decidua, facilitating exchange without mixing blood. The umbilical cord connects fetus to placenta.
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.
Explanation:
Electroporation uses an electric field to create temporary pores in the cell membrane, allowing DNA to enter. Heat shock is a chemical method using CaCl₂ and temperature shift, microinjection physically injects DNA into cells, biolistics is a gene gun for plant cells. Electroporation is efficient for many cell types.
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