10. Which of the following statements about the human circulatory system are correct?2 A Oxygen-poor blood is returned to the heart before it reaches the lungs.B Oxygen-poor blood is retumed directly to the lungs without reaching the heart first.C Contraction and relaxation of the muscles in...
aThe respiratory system, is made up of the gas-exchanging organs (the lungs and respiratory passages) and a pump that ventilates the lungs. The pump consists of the chest wall, the respiratory muscles, which increase and decrease the size of the thoracic cavity; the centers in the brain ...
aInternal respiration is the process by which cells obtain energy by oxidation of chemical compounds; external respiration is the process of exchange of oxygen with the external environment, which is accomplished by the lungs. 内部呼吸作用是细胞由化合物的氧化作用得到能量的过程; 外在呼吸作用是交易...
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What are tiny air sacs at the end of the bronchioles in the lungs that provide surface area for gas exchange to occur within the circulatory system? What type of membrane is the pleural membrane? Which compound affects the surface tension of alveoli in the lungs a...
What are tiny air sacs at the end of the bronchioles in the lungs that provide surface area for gas exchange to occur within the circulatory system? Select the correct answer. Which part of the respiratory system does emphyse...
Your body naturally makes mucus every day, and its presence isn't necessarily a sign of anything unhealthy. Mucus, also known as phlegm when it's produced by your respiratory system, lines the tissues of your body (such as your nose, mouth, throat, and lungs), and it helps protect you...
What are the organs of the cardiovascular system and the pulmonary system? What is the flow of blood through the heart and around the body called? What is the name of where the heart is located (area between the lungs)? During which phase in the cardiac cycle is the pressure in ...
第四段中有“…aging results in limited flow of blood in the lungs and also reduces the strength of the heartbeat.”。9.考查动词。第四段中有“The ability or the immune system to produce disease-fighting antibodies(抗体)is greatly reduced”。其中weaken/decrease与reduce同义。10.考查名词。最后一...
10. Which of the following statement(s) about humans, fish and plants is / are false? (1)The gullet and gills are part of the respiratory system.B Gaseous exchange happens at the lungs, gills and stomata.C Carbon dioxide and oxygen are transported by the blood in humans and fish.(1)...