Concept of Ecology — DU B.Sc. (Hons.) Zoology Previous Year Question Papers

Sustaining Systems/ DSC-9 3. Draw well-labelled diagrams wherever necessary. 1. (a) Define the following (any three): (i) Macula densa (11) Haldane effect (iv) Cardiac reserve (b) Differentiate between the following : (6) (i) Peristalsis and segmentation. (ii) Auerbach's plexus and Meissner's plexus. (i) Tricuspid and mitral valve. (c) Expand the following : (2) (d) Give the location and function of the following: (4) (i) Type Il alveolar cells (ii) Paneth cells (iv) Intercalated discs 2. (a) Describe the different phases of the cardiac cycle. Ilustrate the pressure and volume changes during a complete cardiac cycle. (10) (b) Add a note on the fibrinolytic system, giving its significance. (5) 3. (a) Explain Frank Starling's law of the heart. Describe various factors for regulating stroke volume and (9) heart rate. (b) Describe various pulmonary volumes and capacities. Illustrate their relationship with the help (6) of a labelled diagram. 4. (a) Explain, how the counter-current exchange mechanism helps in the formation of diluted urine. (9) (b) Discuss the hormonal regulation of tubular reabsorption and secretion. (6) 5. (a) Give a detailed account of mechanical and chemical digestion in the stomach. (10) (b) Explain how bile plays a role in the digestion of fat. (5) 6. Write short notes (any three) : (5+5+5) (i) Carbohydrate absorption in the small intestine. (ii) Formation of HCl in the stomach. (iv) Conduction system of the heart.