2. What is the main organ of the respiratory system? a. alveoli b. bronchi c. diaphragm d. lungs 3. These are small pouches or sacs in the lungs where exchange of carbon dioxide and oxygen takes place, a. bronchial tube b. nostrils c. alveoli d. nasal cavity 4. Which part of the circulatory system carries blood throughout the body? a. blood vessels b. heart c. blood d. veins 5. It is the pumping organ of the circulatory system a. heart b. blood c. blood vessels d. veins 6. It is referred to as the river of life. a. blood vessels b. heart d. capillaries c. blood 7. It is considered as the functional unit of the nervous system a. brain b. neurons e. muscles d. bones
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Answer:
2. D. LUNGS
Explanation:
The lungs are the essential organs of the respiratory framework in people and most creatures including a couple of fish, and a few snails. In well evolved creatures and most different vertebrates, two lungs are situated close to the spine on one or the other side of the heart. Their capacity in the respiratory framework is to separate oxygen from the air and move it into the circulation system, and to let carbon dioxide out of the circulation system into the environment, in a course of gas trade. Breath is driven by various strong frameworks in various species. Vertebrates, reptiles and birds use their various muscles to help and encourage relaxing. In prior tetrapods, air was crashed into the lungs by the pharyngeal muscles through buccal siphoning, a system actually found in creatures of land and water. In people, the primary muscle of breath that drives breathing is the stomach. The lungs additionally give wind current that makes vocal sounds including human discourse conceivable.
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