A) liver
B) heart
C) blood
D) kidney
Correct Answer: A
Solution :
Liver is the largest and most important gland of the vertebrate body. The liver cells (hepatocytes) are polyhedral in shape. Usually a hepatic lobule (minute polyhedral unit of liver lobe) is described to have cords of hepatocytes radiating from the central venule and separated from each other by corresponding radiating venous sinusoids. The intralobular or interlamenar venous sinusoids are lined by endothelial cells, some of which are stellate or Kupffer cells (hepatic macrophages). The Kupffer cells are active phagocytes. These phagocytise worn out and dead red blood corpuscles and breakdown their haemoglobin. Blood is red coloured liquid connective tissue which is derived from embryonic mesoderm. It contains plasma, RBCs and WBCs. It reaches into the various organs through the blood vessels and transports various chemical substances between different tissues. Heart is reddish, roughly conical, highly muscular, mesodermal hollow organ of the size of ones fist. It lies behind the sternum in the mediastinum space of thoracic cavity in between the two lungs.
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