Tareq asked:


1) Cells of the immune system use the circulatory system as a medium to patrol the body.
2) Cells of the immune system use the circulatory system to mature.
3) Cells of the immune system use the circulatory system for B-cell activation.
4) Cells of the immune system use the circulatory system for replication.
The answer should be 1 or 4

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garyparkinson asked:

A simple but effect animation how the heart works Discaimer: A single copy of these materials may be reprinted for noncommercial personal use only. “Mayo,” “Mayo Clinic,” “noncommercial use only, provided you include all applicable notices and disclaimers.

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