HKIN 191 Final Exam | Questions And Answers Latest {2024- 2025} A+ Graded | 100%
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Three major functions of ventilatory system - 1.Supply O2 required in metabolism
2.Eliminate CO2 produced in metabolism
3.Regulate hydrogen ion concentration [H+] to maintain
acid-base balance
conducting zone - -Conducts air to respiratory zone
-Humidifies, warms, and filters air
Respiratory zone - -Exchange of gases between air and blood
Hemoglobin - Hemoglobin molecule consists of globin composed of four subunit polypeptide chains.
Each polypeptide contains single heme group with its single iron atom acting as an oxygen "magnet"
Myoglobin - Shuttles O2 from the cell membrane to the mitochondria
Sympathetic nerve fibers - mediate excitation.
Parasympathetic activation - inhibits excitation.
Motor unit - a motor nerve and any muscle fibers it innervates.
Slow oxidative fibers - highly aerobic, don't fatigue easily, don't generate as much force
Fast glycolytic fibers - rely on glycolysis
Respond to strength training very well
(sprinters)
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