The fibrous partitions of the lungs that contain smooth muscles, elastic fibers, and lymphoid structures are the ________.
Fill in the blank(s) with the appropriate word(s).
trabeculae
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A premature baby born at 27 weeks gestation is suffering from respiratory distress syndrome. What is the probable cause?
A. The foramen ovale failed to close at birth. B. Fluid in the lungs was not adequately reabsorbed by the blood and lymphatic capillaries. C. The alveoli are not adequately developed by 27 weeks. D. The breath was not vigorous enough to pop open the alveoli. E. There is not enough surfactant to keep the alveoli from collapsing.
Bird wings and insect wings are considered to be homologous structures
Indicate whether the statement is true or false
An area of the retina that contains only cones and is the site of sharpest vision is the
A) optic disc. B) inner segment. C) fovea. D) outer segment. E) tapetum lucidum.
____________________ are cell-to-cell connections through which materials can pass from the cytosol of one cell into the cytosol of an adjacent cell
Fill in the blank(s) with correct word