In this way, the holes can move through the rock. Indeed, they do this so easily, Dr Freund has calculated, that many of them move out of the section of rock under stress altogether, leaving it with a surplus of electrons. Thus, a granite battery is charged.
Phlebotomy is the act of drawing blood from a patient through the use of medical needles. The blood extracted through the needle is then studied by a physician in order to determine the patient's health condition. The blood may also be used in other patients in the form of a blood transfusion.
To collect blood from an arm vein, the phlebotomist first applies a tourniquet to the upper arm to slow blood flow. An alcohol swab is used to disinfect a small area near the inside of the elbow. The phlebotomist then locates a vein and inserts a needle, a process called âvenipuncture.â Phlebotomists can also sample blood through skin puncture, such as pricking a finger to test a patientâs blood sugar or determine blood type. The phlebotomist must ensure that all equipment is properly sanitized before it is used to collect blood. Accurate labeling, proper storage and careful transport are also key responsibilities. Misidentification or contamination of a blood sample can have serious consequences, because medical professionals rely on blood test results to diagnose patients and monitor treatment progress.