Question 15 Why is the blood-testis barrier important? 0 because spermatozoa and

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Question 15 Why is the blood-testis barrier important? 0 because spermatozoa and developing cells produce surface antigens that are recognized as foreign by the immune system o because some blood contents are toxicto the spermatozoa because immature sperm cells lose their motility when they encounter any blood component O Actually, the blood-testis barrier has no function. D Question 16 Which layer of the digestive wall is responsible for most of its movement? O submucosa 0 muscularis mucosa muscularis externa both muscularis mucosa and external D Question 17 The mechanical and chemical receptors that control digestive activity are located only in the esophagus because this is the only part of the tract that needs to change to accommodate food passage o in the pons and medulla in the walls of the tract organs in the glandular tissue that lines the organ lumen

Explanation / Answer

Ans 15. A. Spermatozoa produces some surface antigens which if exposed to blood will cause immune reaction as these are assumed as foreign to our body.

Ans16. C. Muscularis externa is responsible for movement of gut wall. Muscularis mucosa only brings nutrients from lumen to wall.

Ans 20. D. It is the phase in which secretion occurs just by thought, sight or smell of food.

Ans 21. B. Intrinsic factor is responsible for absorption of vit b12 which is required for production of haemoglobin. So intrinsic factor is required.

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