For gas exchange to be efficient, the respiratory membrane must be ________
A) between 5 and 6 micrometers thick
B) at least 3 micrometers thick
C) 0.5 to 1 micrometer thick
D) The thickness of the respiratory membrane is not important in the efficiency of gas exchange.
C
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The three main anatomical regions into which the ear is divided are
A) malleus, incus, and organ of Corti. B) external ear, middle ear, and inner ear. C) external ear, tympanum, and stapes. D) ceruminous gland, cochlea, and utricle. E) None of the answers are correct.
________ are white blood cells that differentiate into macrophages.
Fill in the blank(s) with the appropriate word(s).
The brachial vein is the most common site of blood pressure measurement with the sphygmomanometer
Indicate whether the statement is true or false
Which hormones are secreted by the thymus gland? select all that apply.
a) thymopoietin b) thymulin c) insulin d) melatonin