White blood cells, part of the ___________ system, work closely with the ___________ system to protect us from infection and disease.
A) circulatory; immune
B) endocrine; lympathic
C) circulatory; excretory
D) circulatory; respiratory
To answer this question, you need to have some knowledge of the human body systems and their functions. The first blank refers to the system that white blood cells belong to, while the second blank refers to the system that works closely with the first system to protect us from infection and disease.
To find the correct answer, you can analyze the options one by one:
A) circulatory; immune: The circulatory system, consisting of the heart and blood vessels, transports blood throughout the body. The immune system defends the body against harmful invaders, such as bacteria and viruses. Since white blood cells are important in the immune response, this option seems plausible.
B) endocrine; lymphatic: The endocrine system consists of glands that produce hormones to regulate various bodily functions. The lymphatic system helps maintain fluid balance and aids in the immune response. While both systems play vital roles in the body, white blood cells are primarily associated with the immune system, so this option is less likely.
C) circulatory; excretory: The excretory system eliminates waste products from the body, such as urine. While the circulatory system is involved in transporting waste products to the excretory organs, it does not directly work with white blood cells to protect us from infection and disease. Therefore, this option is unlikely.
D) circulatory; respiratory: The respiratory system is responsible for the exchange of gases, supplying oxygen and removing carbon dioxide. Although oxygen is essential for the proper functioning of white blood cells, the respiratory system is not directly implicated in the immune response. Thus, this option is less likely.
Based on this analysis, the most suitable answer is A) circulatory; immune.