Number 16 and 17 both

Dear student, 
16. In mammals, T-tubules are present on the boundary region of A and I bands, therefore, there are 2 tubules per sarcomere.
Option b is correct.

17. When oxygenated blood is transferred from mother to fetus, it enters the right side of heart and flows into the upper chamber right atrium.
option d is correct.

Regards
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