Match the cells and their secretions:
| Cell Type | Secretion | 
| a) Goblet cell | i) succusentericus | 
| b) Oxyntic cells | ii) mucus | 
| c) Chief cells | iii) acid | 
| d) Intestinal gland cells | iv) pepsinogen | 
Tidal volume (TV) = volume moved in one breath. Normal = 500 ml
So ratio = 350:150= 7:3