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Cilia of the trachea that beat continually propel contaminated mucus _
toward the throat to be swallowed or spat out
NOT true of inspiration _
relaxation of the external intercostal muscles helps increase the size of the thoracic cavity
The most important chemical stimuli leading to increased rate and depth of breathing is _
increased carbon dioxide in the blood
The three mucosa covered projections into the nasal cavity that greatly increase surface area of mucosa exposed to air are called _
Which one of the following is the correct sequence of events that follows a threshold potential: a. potassium channels open and potassium ions diffuse outward while sodium is actively transported out of the cell
b. sodium channels open and sodium ions diffuse inward
c. the membrane becomes repolarized.
d. the membrane becomes depolarized
1. sodium channels open and sodium ions diffuse inward
2. the membrane becomes depolarized
3. potassium channels open and potassium ions diffuse outward while sodium is actively transported out of the cell
4. the membrane becomes repolarized.
Large wrinkle like folds in the stomach lining, present when the stomach is empty, that allow for expansion when the stomach is filling are called _
Amino acids that cannot be made by human body cells and therefore must be ingested in the diet are said to be _
essential amino acids
the outermost to the innermost layer of a blood vessel wall is layered _ _ _
1. tunica externa
2. tunica media
3. tunica intima.
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