Pasagot Po please



.16. It is referred to us the river of life. a. Blood vessels b. heart c. capillaries d. blood 17. It is considered as the functional unit of the nervous system. A. brain b. neurons c. muscles d. bones 18. It controls and coordinates the activities of the whole nervous system. a. Central nervous system b. sympathetic nervous system C. nervous system d. brain 19. It is a system that controls other parts of the body. a. Nervous system b. circulatory system c. digestive system d. respiratory system 20. It is the primary organ of the central nervous system contained within the skull. Brain b. axon c. dendrites d. cell body 21. Why is respiratory system very important to the body? A. It enables carbon dioxide to get into the body? B. It consists of body parts that help the body receive oxygen? C. It helps distribute carbon dioxide to the body. D. It enables the blood to circulate in your body. 22. How dos oxygen in the air get into the blood? a.​