Cystic fibrosis is a deadly disease that causes mucus secretions in the body to become abnormally thick. The respiratory system struggles to clear out bacteria caught in this mucus because a certain epithelial tissue lining the lungs cannot "sweep" it away, causing frequent infections. This type of epithelium is called ________.
What will be an ideal response?
pseudostratfied columnar epithelium
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Masses of gray matter within the central nervous system are
A) ganglia. B) columns. C) nuclei. D) commissures. E) horns.
The ________ muscle ejects urine or semen in the male
Fill in the blank(s) with the appropriate word(s).
What is the effect of sympathetic innervation to the lungs?
A. Increased activity of the mucociliary elevator B. Dilation of bronchioles C. Contraction of smooth muscle in the bronchioles D. Constriction of bronchioles E. Increased diameter of the bronchi
Which of the following statements about the refractory period of neuronal or muscle membranes is TRUE?
A. In nerve cells, the absolute refractory period coincides with the period of increased K+ permeability. B. In skeletal muscle cells, the absolute refractory period lasts about as long as the twitch. C. The relative refractory period in neuronal membranes lasts about the same length of time as the absolute refractory period in cardiac muscle cell membranes. D. The refractory period in an alpha-motor neuron membrane is much briefer than the refractory period in a skeletal muscle cell membrane. E. In ventricular cells, the absolute refractory period coincides with the period of increased Na+ and Ca2+ permeability.