. Platelets are continually produced in the red bone marrow by cells called _____________
Fill in the blank with correct word.
megakaryocytes
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The central canal of an osteon contains
A) bone marrow. B) osteocytes. C) concentric lamellae. D) blood vessels. E) lacunae.
What part of the cochlea do the hair cells vibrate against?
A) scala tympani B) basilar membrane C) scala vestibuli D) tectorial membrane
The ________ is a remnant of an important fetal blood vessel that once linked the pulmonary and systemic circuits
A) fossa ovalis B) ductus arteriosus C) foramen ovale D) ductus venosus E) ligamentum arteriosum
If tissue oxygen demand increases and respiratory rate and tidal volume remain the same, what happens?
A) Alveolar PO2 increases; blood and tissue PCO2 decreases. B) Alveolar PO2 decreases; blood and tissue PCO2 decreases. C) Alveolar PO2 increases; blood and tissue PCO2 increases.