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NR 507 Week 4 Midterm Exam (100 out of 100) Questions and Answers (GRADED A) $9.99
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NR 507 Week 4 Midterm Exam (100 out of 100) Questions and Answers (GRADED A)

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NR 507 Week 4 Midterm Exam (100 out of 100) Questions and Answers (GRADED A)

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  • May 14, 2024
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  • 2023/2024
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NR 507 Week 4 Midterm Exam (100 out of 100)
Questions and Answers (GRADED A)
How does blood flow through the heart?

Deoxygenated venous blood → Sup. Vena Cava → Right Atrium →Tricuspid (AV) →Empties into R.
Ventricle (& it contracts) → Blood ejected through Pulmonary Valve → Pulmonary Artery → Lungs to be
Oxygenated → Pulmonary Veins → L. Atrium → Mitral (AV) → L. Ventricle (pumps with each
contraction) → Aortic Valve → Aorta → Body




What is systole?

Contraction of the heart which pumps blood




Diastole

Relaxation of the heart




What produces S1 and S2 sound?

closing of the heart valves




What produces S1?

The mitral and tricuspid valves which close in systole




What produces S2 sound?

The closing of the aortic and pulmonic valves in diastole

,What is cardiac output?

the volume of blood pumped out by each ventricle per minute




What is stroke volume?

amount of blood pumped out by each ventricle with contraction




What determines cardiac output?

stroke volume and heart rate




What is preload?

the degree of stretch on the heart before it contracts, related to ventricular filling, end diastolic
pressure, amount of blood entering the ventricle during diastole




What is afterload?

resistance left ventricle must overcome to circulate blood




What is contractility?

Normal ability of muscle to contract at a given force for a given stretch. It is independent of
preload/afterload




Will sustained tachycardia result in increased or decreased stroke volume?

Decreased

, What conditions can result in decreased contractility?

Ischemia, acidosis, cardiomyopathy




What can cause increase afterload?

HTN, pulmonary disease, damage to the aortic valve




What has the most immediate effect on afterload?

HTN




Why would hemorrhaging cause decreased afterload?

Decreased volume of blood creates less resistance




What does increased preload do to stroke volume?

Increases stroke volume, over time the body will be unable to compensate however




What can cause a decreased preload?

Hemorrhage, dehydration...anything that causes reduced blood volume




What side of the heart is affected by cor-pulmonale?

Right (AKA Right sided HF)

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