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NUR 306 Exam 3 Question and answers rated A+ Ventilation - correct answer the process of moving gases into and out of the lungs Perfusion - correct answer the ability of the cardiovascular system to pump oxygenated blood to the tissues and return deoxygenated blood to the lungs Diffusi...

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  • November 18, 2024
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  • 2024/2025
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NUR 306 Exam 3 Question and answers
rated A+
Ventilation - correct answer ✔the process of moving gases into and out of
the lungs


Perfusion - correct answer ✔the ability of the cardiovascular system to pump
oxygenated blood to the tissues and return deoxygenated blood to the lungs


Diffusion - correct answer ✔exchange of respiratory gases in the alveoli and
capillaries


Work of breathing - correct answer ✔the effort required to expand and
contract the lungs


Inspiration - correct answer ✔an active process stimulated by chemical
receptors in the aorta


Surfactant - correct answer ✔chemical produced in the lungs to maintain the
surface tension of the alveoli and keeping them from collapsing


Atelectasis - correct answer ✔collapse of the alveoli that prevents the normal
exchange of oxygen and carbon dioxide


Pulmonary circulation - correct answer ✔moves blood to and from the
alveolar capillary membranes for gas exchange


Oxygen transport - correct answer ✔lungs and cardiovascular system

,CO2 transport - correct answer ✔diffuses into red blood cells and is hydrated
into carbonic acid


Myocardial pump - correct answer ✔two atria and two ventricles
-as the myocardium stretches, the strength of the subsequent contraction
increases (Starling's Law)


Myocardial blood flow - correct answer ✔unidirectional through four valves
-S1: mitral and tricuspid close
-S2: aortic and pulmonic close


Systemic circulation - correct answer ✔arteries and veins deliver nutrients
and oxygen and remove waste products


Coronary artery circulation - correct answer ✔coronary arteries supply the
myocardium with nutrients and remove wastes


Cardiac output - correct answer ✔amount of blood ejected from the left
ventricle each minute


Stroke volume - correct answer ✔amount of blood ejected from the left
ventricle with each contraction


Preload - correct answer ✔end-diastolic pressure


Afterload - correct answer ✔resistance to left ventricular ejection

, Autonomic nervous system - correct answer ✔influences the rate of impulse
generation and the speed of conduction pathways


Sympathetic nervous system - correct answer ✔increases the rate of
impulse generation and impulse transmission and innervations all parts of the
atria and ventricle


Parasympathetic system - correct answer ✔decreases the rate and
innervates atria, ventricles, and sinoatrial and atrioventricular nodes


Conduction system - correct answer ✔originates with the SA node or
pacemaker and is transmitted to the AV node, bundle of His, and Purkinje
fibers


Electrocardiogram (ECG) - correct answer ✔reflects the electrical conduction
system of the heart


Factors affecting oxygenation - correct answer ✔decreased oxygen-carrying
capacity, hypovolemia, decreased inspired oxygen concentration, increased
metabolic rate (fever), chronic diseases, and conditions affecting chest wall
movement


Disturbances in conduction - correct answer ✔caused by electrical impulses
that do not originate from the SA node (dysrhythmias)


Altered cardiac output - correct answer ✔insufficient volume is ejected into
the systemic and pulmonary circulation; result of left or right sided HF


Impaired valvular function - correct answer ✔acquired or congenital disorder
of a cardiac valve by stenosis or regurgitation

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