The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium. From the left atrium blood flows into the left ventricle. The left ventricle pumps the blood to the aorta which will distribute the oxygenated blood to all parts of the body.
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When air leaves the pharynx it passes into the larynx. As the air expired, the vocal cords vibrate which enable us to make a sound
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Each bronchiole ends in a tiny air sac called alveoli. this alveoli is surrounded by several numbers of capillaries. The exchange of O and CO2 between blood and air occurs on this wall
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The trachea divides into two cartilage tubes called bronchi. This part is also covered with cilia.
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The air enters your respiratory systems through your nostrils
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The air goes through your nose and nasal passages. these passages are equipped with hairs mucus and cilia that moisten, filter and warm the air before entering your lungs
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Note: Ikaw nalang magdecide kung C or D yung sagot mo for me di ako sure Yung sagot.
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