As you are out hiking out, you admire the stunning sunset an…

As you are out hiking out, you admire the stunning sunset and the smell of spring flowers in the breeze. Your brain, overwhelmed by all the other input, fails to make you conscious of what is below your feet. You step on a rusty nail. Instantly, thanks to a reflex arc, processed by your spinal cord, rather than your brain, you retract your foot.However, the skin has been broken. Since your four-chambered heart is pumping, a little bit of blood gushes out. Nonetheless, some bacteria get into your body. Macrophages arrive at the site of injury, in response to chemical signals secreted by the crushed cells. These white blood cells “squeeze” out of the nearest capillary/blood vessel via ___________.