White blood cells
a. are the most abundant type of blood cell
b. do not have nuclei
c. are actually only cell fragments
d. defend the body against foreign invasion
e. are found only in the blood
D
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Which of the following is NOT a respiratory structure?
A. Larynx B. Esophagus C. Bronchus D. Nose
In the flat skull bones, the middle spongy layer of bone sandwiched between two layers of compact bone is called the ________.
Fill in the blank(s) with the appropriate word(s).
Two opposing mechanisms determine alveolar expansion: ________ leads to alveolar expansion, while ________ opposes alveolar expansion.
A. positive pleural pressure; lung recoil B. negative pleural pressure; lung recoil C. lung recoil; negative pleural pressure D. lung recoil; positive pleural pressure
What structure cools the warm blood from the testicular artery?
A. Dartos muscle B. Ductus deferens C. Cremaster muscle D. Pampinform plexus