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  Urinary system Major organs :- 1)   Kidneys - 2 2)   Ureters - 2 3)   Urinary bladder - 1 4)   Urethra - 1   Kidneys : Ø The structural and functional unit of kidney is nephron. Ø Kidney is bean shaped organ and brown in colour. Ø The dimension of kidney is length - 11cm, breadth - 6cm and width - 3cm. Ø It is extended from thoracic 12­­­ th vertebra to 3 rd lumber vertebra. Ø Right kidney is slightly lower in level than left kidney due to presence of liver in right side. Ø Kidney filters the whole blood in 4 minutes. Ø Outer part of kidney is called cortex and inner part is medulla. Ø Hormones secreted by kidney are Vitamin D 3 , Renin Erythropoietin Ø 25% blood of cardiac output goes in kidney.   Nephrons : ·       Each kidney consists of 1-3 million nephrons. ·       One nephron is 6cm. ·       Parts of nephrons (4) : 1...

  Digestive system Major organs :- 1)   Mouth 2)   Pharynx 3)   Oesophagus 4)   Stomach 5)   Intestine (small and large) 6)   Rectum 7)   Anal canal   Accessory organs: 1)   3 pairs of salivary glands 2)   Pancreas 3)   Liver and biliary tracts   Length of different digestive organs : Ø Pharynx - 12-14cm Ø Oesophagus - 25cm Ø Stomach - 25cm Ø Small intestine - 5.25m ·       Duodenum - 25cm ·       Jejunum - 2m ·       Ileum - 3m Ø Large intestine - 1.5m Ø Rectum - 13cm Ø Anal canal - 3.8cm   Taste area of tongue : Ø Tip of tongue - Sweet and salt Ø Back of tongue - Bitter Ø Side of tongue - Sour   §   Dental formula of primary teeth - 2102 §   Dental formula of permanent teeth - 2123 §   Total number of primary teeth - 20 §   Total number of...