Final answer:
To increase blood flow during micro-collection for medical analysis, the site can be warmed or the subject's hand can be lowered below the heart level before using capillary action to collect the blood sample.
Step-by-step explanation:
In order to increase blood flow for a micro-collection, a medical professional can use capillary action. Capillary action is the ability of a liquid to move against gravity in a narrow space, such as a small-diameter glass tube.
When the tube is brought in contact with the surface of the skin, the blood is drawn into the tube due to capillary action.