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Biology - Exemplar

18. Body Fluids and Circulation

1. The Living World
2. Biological Classification
3. Plant Kingdom
4. Animal Kingdom
5. Morphology of Flowering Plants
6. Anatomy of Flowering Plants
7. Structural Organisation in Animals
8. Cell : The Unit of Life
9. Biomolecules
10. Cell Cycle and Cell Division
11. Transport in Plants
12. Mineral Nutrition
13. Photosynthesis in Higher Plants
14. Respiration in Plants
15. Plant Growth and Development
16. Digestion and Absorption
17. Breathing and Exchange of Gases
18. Body Fluids and Circulation
19. Excretory Products and Their Elimination
20. Locomotion and Movement
21. Neural Control and Coordination
22. Chemical Coordination and integration
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Q. 115.0( 1 Vote )

What is the signi

Class 11th Biology - Exemplar 18. Body Fluids and Circulation

Answer :

Time gap in the passage of action potential from sino-atrial node to the ventricle allows ventricles to relax. This causes ventricular pressure to fall leading to the closure of semilunar valves which prevents the backflow of blood into the ventricles.

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