Final answer:
When Terry has a disease that reduces the number of blood cells her body produces, the pair of body systems that would most likely be involved are the circulatory system and the immune system. The circulatory system is responsible for transporting blood throughout the body, including red and white blood cells. The immune system relies on white blood cells to fight off infections, so if Terry has fewer white blood cells, her immune system would be weakened.
Step-by-step explanation:
When Terry has a disease that reduces the number of blood cells her body produces, the pair of body systems that would most likely be involved are the circulatory system and the immune system.
The circulatory system, which includes the heart and blood vessels, is responsible for transporting blood throughout the body. Blood contains red blood cells, which carry oxygen, and white blood cells, which help fight off infections. If Terry's disease reduces the number of blood cells produced, it would affect the circulatory system.
The immune system, which includes various organs, tissues, and cells, helps protect the body from pathogens such as bacteria and viruses. White blood cells play a crucial role in the immune system by identifying and destroying pathogens. If Terry has fewer white blood cells, her immune system would be weakened and she may be more susceptible to infections.