Question

question 1
write out the process of blood flowing through the heart. begin with low - oxygen blood returning to the heart from the body. your response should include the terms: pulmonary artery, aorta, pulmonary vein, superior vena cava, inferior vena cava, left atrium, right atrium, left ventricle, right ventricle, mitral valve, tricuspid valve.

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question 2
explain the process of breathing. begin with inhalation and describe the route that the air takes to the lungs, and what happens when the air reaches the lungs. include in your description the terms: mouth, nose, pharynx, larynx, trachea, bronchi, lungs, alveoli, carbon dioxide, oxygen, and capillaries.

Explanation:

Question 1:

Low - oxygen blood returns to the heart via the superior vena cava and inferior vena cava into the right atrium. Then it passes through the tricuspid valve into the right ventricle. From the right ventricle, it is pumped through the pulmonary artery to the lungs. In the lungs, the blood picks up oxygen and releases carbon dioxide. Oxygen - rich blood returns to the heart via the pulmonary veins into the left atrium. It then passes through the mitral valve into the left ventricle. Finally, the left ventricle pumps the oxygen - rich blood out through the aorta to the rest of the body.

Question 2:

During inhalation, air enters the body through the mouth or nose. It then passes through the pharynx and larynx into the trachea. The trachea divides into two bronchi, which lead to the lungs. In the lungs, the bronchi further divide into smaller tubes. The air reaches the alveoli, which are tiny air - sacs surrounded by capillaries. Oxygen from the air diffuses across the alveolar - capillary membrane into the capillaries and binds to hemoglobin in red blood cells. At the same time, carbon dioxide diffuses from the blood into the alveoli and is exhaled out of the body during exhalation.

Answer:

Question 1:

Low - oxygen blood returns via superior and inferior vena cava to right atrium, through tricuspid valve to right ventricle, then via pulmonary artery to lungs. Oxygen - rich blood returns via pulmonary veins to left atrium, through mitral valve to left ventricle and out via aorta.

Question 2:

Air enters through mouth/nose, passes pharynx, larynx, trachea, bronchi to lungs. In alveoli, oxygen diffuses into capillaries and carbon dioxide diffuses out for exhalation.