The system responsible for fighting the pathogens is:
Correct answer: D. Immune System
- A. Muscular System
- B. Endocrine System
- C. Nervous System
- D. Immune System
Explanation
The system that is responsible for fighting the pathogens in the human body is called the immune system. The endocrine system deals with all the hormones, nervous system deals with nerve impulses coming to the human body and its responses to these stimuli. The muscular system deals with movement.
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About Circulation
The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
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