Question

you fall and scrape your elbow. after a couple of hours there is a redness on the cut indicating an infection
the redness and inflammation on the cut are from the blood traveling through your
__________system to the site of the infection.
along with the red blood cells, white blood cells from the
__________system travel to the site to fight the infection

Explanation:

The circulatory system is responsible for transporting blood (including red blood cells) to different parts of the body. The immune system contains white blood cells which are crucial for fighting infections.

Answer:

circulatory; immune