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Heart as a Pump

Heart as a Pump 1 - Physiology - Test 2

QuestionAnswer
The heart is composed of how many chambers? Four
What parts of the heart receive blood from the great veins? Left and right atria
Describe the atria in terms of wall thickness and number of muscle fibers? Thin-walled; contains relatively few muscle fibers
Which is more muscular, the left ventricle or the right ventricle? Left ventricle
Which pumps blood to the systemic circulation, the right ventricle or the left ventricle? Left ventricle
What separate the ventricles of the heart? Interventricular septum
Where does the blood return to the heart from systemic circulation? Right atrium
Through which great vein does the blood return from the systemic circulation to the heart? Vena cava
Which vena cava drains the head and upper extremities? Superior vena cava
What does the superior vena cava drain? Head and upper extremities
Which vena cava drains the viscera and lower extremities? Inferior vena cava
What does the inferior vena cava drain? Viscera and lower extremities
The viscera is drained by which vena cava? Inferior vena cava
The head is drained by which vena cava? Superior vena cava
What kind of blood flows into the right atrium? Deoxygenated
What happens when the pressure in the vena cava exceeds the pressure in the right atrium? Deoxygenated blood flows into the right atrium
What causes deoxygenated blood to flow into the right atrium? Pressure in the vena cava exceeding the pressure in the right atrium
What happens when the pressure in the right atrium exceeds the pressure in the right ventricle? The tricuspid valve opens and blood flows passively into the right ventricle.
What causes the tricuspid valve to open? Pressure in the right atrium exceeding the pressure in the right ventricle
If 75% of the stroke volume is the blood flowing passively into the right ventricle, what forces the remaining blood into the right ventricle? Right atrial contraction
Right atrial contraction forces remaining blood into the right ventricle. What percent of the stroke volume is this? 25%
Where is the blood pumped from the right ventricle? Through the pulmonary artery to the lungs
What forces the pulmonic valve to open? Right ventricular contraction increasing right ventricular pressure
Deoxygenated blood flows from the ___________ through the pulmonary artery to the lungs. Right ventricle
___________ blood flows from the right ventricle through the pulmonary artery. Deoxygenated
Deoxygenated blood flows from the right ventricle through the _____________. Pulmonary artery
Which is the only artery that carries deoxygenated blood? Pulmonary artery
Deoxygenated blood flows from the right ventricle through the pulmonary artery to the _________. Lungs
_________ blood returns to the left atrium via the pulmonary veins. Oxygenated
Oxygenated blood returns to the ________ via the pulmonary veins. Left atrium
When the pressure in the __________ exceeds the pressure in the _________, the mitral valve opens. Left atrium; left ventricle
The mitral valve opens when ________________. The pressure in the left atrium excceds the pressure in the left ventricle.
What happnes when the pressure in the left atrium exceeds the pressure in the left ventricle? The mitral valve opens and blood flows passively into the left ventricle.
What causes the mitral valve to open? Pressure in the left atrium exceeding the pressure in the left ventricle
What percent of the stroke volume is blood flowing passively into the left ventricle upon opening of the mitral valve? 75%
What causes the remaining blood in the left atrium to move into the left ventricle after the 75% passively flows into the left ventricle? Contraction of the left atrium
Following the left ventricle, where is the blood pumped? Into the aorta.
What causes the aortic valve to open? Contraction of the left ventricular wall which increases the left ventricular pressure.
Blood flows from the left ventricle through the ______ to the systemic circulation. Aorta
Blood flows from the left ventricle through the aorta to the _____________. Systemic circulation
Created by: P1StudyStack
 

 



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