Red blood cells pick up ____ in the lungs, and transport it via the blood to all cells of the body
a. carbon dioxide
b. albumin
c. oxygen
d. proteins
c
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Before external respiration occurs, the concentration or partial pressure of oxygen in the alveoli is ________ than in the pulmonary capillaries.
A. lower B. higher C. no different
When walking down stairs or a steep hill, the knee is flexed. Which structure prevents the tibia from sliding too far posteriorly, and the femur from sliding too far anteriorly?
A: patellar ligament B: ACL C: PCL D: medial meniscus E: lateral meniscus
A threshold stimulus applied to an excitable membrane is one that is just sufficient to:
A. trigger an excitatory postsynaptic potential. B. cause a change in membrane potential. C. trigger an action potential. D. be conducted to the axon hillock. E. depolarize a dendrite.
The ciliary muscle helps to
A) move the eyeball. B) control the shape of the lens. C) control the amount of light reaching the retina. D) control the production of aqueous humor.