________ are free phagocytes found in the lungs.
Fill in the blank(s) with the appropriate word(s).
Alveolar macrophages
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In most tissues, glucose, a water-soluble substance, crosses capillary walls through
a. water-filled pores b. endothelial cells c. sinusoids d. a and b e. a and c
What is a major function of the respiratory system?
A) deliver oxygen to the blood and remove carbon dioxide from the body B) produce vitamin D and retain water C) return excess tissue fluid to the cardiovascular system D) digest food and absorb nutrients into the blood
The tracts that connect the cerebellum to the brainstem are located in the
A) medulla oblongata. B) pons. C) midbrain. D) diencephalon. E) thalamus.
What type of cellular respiration do muscle cells perform when they do not have oxygen?
A. Anaerobic B. Aerobic C. Glycolysis D. Either aerobic or anaerobic