How is carbon dioxide transported in blood?
What will be an ideal response?
Answer: Most carbon dioxide is transported in blood as bicarbonate. The next most common form is bound to hemoglobin, and the last is physically dissolved carbon dioxide.
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The chorionic villi
A. increase surface area of the amniotic cavity. B. form from branches of the syncytiotrophoblast cords. C. contribute to the formation of the placenta. D. are necessary for implantation to occur. E. are not part of the placental formation.
The ion necessary to initiate the release of acetylcholine into the synaptic cleft is
A) calcium. B) chloride. C) sodium. D) potassium. E) zinc.
Where do the tracts carrying impulses of proprioception and pressure cross?
A. In the medulla oblongata B. In the thalamus C. In the spinal cord at the level the axons enter the cord D. The axons do not cross
Late one night you are leaving the science building during a snowstorm. As you approach your car, your right foot suddenly slips on a patch of ice. Your left leg immediately stiffens as you try to regain your balance. The reflex action you relied upon is a(n)
A. voluntary reflex. B. contralateral reflex. C. unilateral reflex. D. ipsilateral reflex. E. None of the choices is correct.