The pulmonary vein
A. carries oxygen-rich blood toward the body tissues.
B. carries oxygen-poor blood to the lungs.
C. receives oxygen-poor blood from the body tissues.
D. carries oxygen-rich blood from lungs to the left atrium.
Answer: D
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What will be an ideal response?
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A. contraction of skeletal muscle. B. pressure changes in the thorax during respiration. C. compression of lymphatic vessels. D. contraction of smooth muscle in lymph vessel. E. All of the choices are correct.
This figure shows a cross section of the spinal cord. What structure does number 1 indicate?
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Extension decreases the angle between two bones.
Answer the following statement true (T) or false (F)