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The unidirectional flow of blood in vein...

The unidirectional flow of blood in veins is due to the presence of ..............that prevents back flow of blood.

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Semi lunar valves.
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FULL MARKS-BODY FLUIDS AND CIRCULATION-ADDITIONAL QUESTIONS SOLVED ( Fill in the Blanks)
  1. ............. are small, narrow, and thin walled which are connected t...

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  2. The ............... are the site for exchange of materials between blo...

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  3. The unidirectional flow of blood in veins is due to the presence of .....

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  4. Blood vessels that supply blood to the cardiac muscles are ..............

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  5. ........... circulatory system is seen in Arthropoda and most molluses...

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  6. he right atrium receives .............. blood.

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  7. The left atrium receives ................ blood.

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  8. The crocodile has a ................ chambered heart.

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  9. ..........guards the opening between the left atrium and left ventricl...

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  10. The myocardium of the ventricle is thrown into irregular muscular ridg...

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  11. The heart wall is made up of outer epicardium, middle myocardium and t...

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  12. The heart is covered by a double membrane called........

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  13. On the left side of the right atrium there is a node called..............

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  14. The rhythmic contraction and expansion of heart is called.............

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  15. The contraction of the chambers of the heart is called.............

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  16. The relaxation of the chambers of the heart is called.............

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  17. The 'lub'sound is associated with the closure of the............... Va...

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  18. The 'dub' sound is associated with the closure of..................val...

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  19. An increased heart beat is called................

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  20. The decreased heart beat is called....................

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