This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Circulation, Subject name: Physiology
Blood pressure in the dead (i.e., when hea is not beating) is: 
Select and explain. 
A. Zero, B. 6-7 mm Hg, C. 20 mm Hg, D. 40 mm Hg
B: 6-7 mm Hg
Answer: B: 6-7 mm Hg 
Explanation: Beating of the hea causes the pressure in the aeries and aerioles, which allows the blood to flow through the tissues, in spite of the tissue pressure surrounding the vessels. When hea stops beating, the pressure in the vessels will equilibrate with the tissue pressure - about 6-7 mm Hg.