Blood picks up oxygen as it passes through the ______-. A right atrium B systemic capillaries C pulmonary trunk D pulmonary capillaries E left side of the heart
| A |
right atrium
|
|
| B |
systemic capillaries
|
|
| C |
pulmonary trunk
|
|
| D |
pulmonary capillaries
|
|
| E |
left side of the heart
|
Blood comes into the right atrium from the body, moves into the right ventricle and is pushed into the pulmonary arteries in the lungs. After picking up oxygen, the blood travels back to the heart through the pulmonary veins into the left atrium, to the left ventricle and out to the body's tissues through the aorta.
The right upper chamber of the heart. The right atrium receives deoxygenated blood from the body through the vena cava and pumps it into the right ventricle which then sends it to the lungs to be oxygenated. Hence the option A is incorrect.
The systemic capillaries are the junction points between the arteries and the veins of the great circulation. Systemic circulation carries oxygenated blood from the left ventricle, through the arteries, to the capillaries in the tissues of the body. Hence the option B is incorrect.
The pulmonary trunk or main pulmonary artery is the solitary arterial output from the right ventricle, transporting deoxygenated blood to the lungs for oxygenation. Hence the option C is incorrect.
For pulmonary capillaries to receive oxygen at the alveoli, air must be transported to the alveoli. Pulmonary ventilation is the inflow and outflow of air between the atmosphere and the lung alveoli. In the pulmonary capillaries, carbon dioxide is exchanged for oxygen from the alveoli. The blood leaving the lungs, which now has a high oxygen content and a relatively low carbon dioxide content, is distributed to the tissues of the body by the left side of the heart. Hence the option D is correct.
The left side of the heart receives oxygen-rich blood from the lungs and pumps it through the arteries to the rest of the body. Therefore it transports oxygenated blood but blood picks up oxygen at the pulmonary capillaries. Hence the option E is incorrect.
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