emt b ch 5
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3 main functions of musculoskeletal system
- give body shape
- protect internal vital organs
- provide for body movement
when bones connect to bone
out of the 3 muscles which are involuntary muscle?
smooth muscle, and cardiac muscle
out of the 3 muscles which are voluntary muscle ?
what is a voluntary muscle
muscle that can be consciously controlled
what is a involuntary muscle
muscle that responds automatically to brain signals but cannot be consciously controlled
what is the cardiac muscle ?
an involuntary muscle found only in the heart.
what is the purpose of the respiratory system?
ventilation and oxygenation
what is automaticity ?
the ability of the heart to generate and conduct electrical impulses on its own
what is aveoli?
microscopic sacs of the lungs where gas exchange with the bloodstream takes place
what is inhalation?
- an active process in which the intercostal (rib) muscle and the diaphragm contract, expanding the size of the chest cavity and causing air to flow into the lungs.
- diaphragm lowers
what is exhalation?
- a passive process in which the intercostal (rib) muscle and the diaphragm relax, causing the chest cavity to decrease in size and air to flow out of the lungs
- diaphragm rises
what is ventilation?
process of moving gases (oxygen and carbon dioxide) between inhaled air and the pulmonary circulation of blood.
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