________ active immunity occurs when the person is exposed to a live pathogen, develops the disease, and becomes immune as a result of the primary immune response.

________ began writing on the topic of blood circulation and using the experimental method in medicine

a. Galileo b. Harvey c. Hunter d. Galen

A patient was struck in the head with a hammer. Her skin is torn and bleeding. In this case, the mechanism of injury is a _____ force that caused a(n) _____ wound

A) blunt, closed B) penetrating, open C) penetrating, closed D) blunt, open