If a red blood cell is traced through the heart then the blood cell will simply move onward in to veins closest to the heart.
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Answer: hello the options to your question is missing below are the options
options : portal of exit, reservoir, portal of entry
answer :
Reservoir and Portal of exit
Explanation:
JoAnn's lungs are in the RESERVIOR in the chain of transmission
The mucus from her cough is in the PORTAL OF EXIT
Joann's lungs are considered as a reservoir in the chain of transmission because the cold that causes the cough is stored in them while the mucus is considered portal of exit because it it through the mucus that the cough that is in the lungs are expelled
The nose will be considered as both portal of entry and portal of exit because it can play both roles.
