The circulatory system is system in the human body that provides a network through which our blood flows constantly.The human cardiovascular system is considered closed because there are no holes for blood to enter or leave the system. Correct answer: D
In the closed circulatory system the blood stays confined within the vessels and heart.
If you have to drive on a long trip, get plenty of rest before you leave and plan on stopping every two hours.
You should at least rest 15 minutes per 2 hours also.
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Answer:
A.?? B. nucleus. C. Axon Terminal D. Axon/ node of Ranvier/ Myelin/ Schwann cell.
Explanation:
