Important Points to know

1. Weight of Liver : 1.2 to 1.5 kg 

2. Weight of Kidney : 120 to 170 gm 

3. Number of lobes in Liver : 2 

4. Number of salivary glands : 3 pairs 

5. Number of portions in stomach : 4 (Cardiac, fundic, body & Pyloric). 

6. Stomach stores food for : 4 to 5 hours. 

7. pH of saliva : 6.8 

8. pH of gastric juice : 1.8 

9. pH in duodenum : 7.8 

10. pH of urine : 6.0 

11. Breathing rate : 12-16 times/minute 

12. Tidal volume : 500 mL 

13. IRV : 2500 - 3000 mL 

14. ERV : 1000 - 1100 mL 

15. RV : 1100 - 1200 mL 

16. Water in plasma : 90-92% 

17. Water in watermelon : 92%. 

18. Water in herbaceous plants : 85-90%. 

19. Water in human cell : 70-90%. 

20. Colon is divided in : 4 parts (Ascending, transverse, descending and 

sigmoid parts). (NCERT Correction-2019-20) 

21. Solubility of CO2 is 20-25 times higher than that of O2 . 

22. Diffusion membrane is made up of 3 layers. 

23. Total thickness of diffusion membrane : < 1 mm 

24. No. of wall layers in alimentary canal (from oesophagus to rectum) : 4 

25. Gastric gland have 3 type of cells : Mucus neck cells, chief cells and parietal cells 

26. Every 100 ml of oxygenated blood can deliver how much O2 

 to tissues : 5 mL 

27. Every 100 ml of deoxygenated blood delivers how much CO2 

 to the alveoli : 4 mL