What forces must be overcome to move air into the respiratory system? 1. Tissue movement 2. Elastic forces of lung tissue 3. Airway resistance 4. Surface tension forces
a. 1, 2, and 3 only
b. 2 and 4 only
c. 4 only
d. 1, 2, 3, and 4
ANS: D
Elastic forces involve the tissues of the lungs and thorax, along with surface tension in the alveo-li. Frictional forces include resistance caused by gas flow and tissue movement during breathing.
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The mechanism in which the atria are depolarized with a backward flow of electricity is called ________ conduction
A) retrograde B) negative C) backward D) junctional
An atom is defined as
negatively charged elements that circle the nucleus. positively charged ions released when electrical activity is applied. one or more units of any element combined to create energy. the fundamental unit of any element; composed of the nucleus and orbiting electrons.