What is the influence of an increased lung volume on the right ventricle?
A. increased preload
B. increased afterload
C. increased myocardial contractility
D. increased cardiac output
?ANS: B
A. Incorrect response: See explanation B.
B. Correct response: Right and left ventricular ejection are affected by changes in the pleural pressure or by changes in the lung volume during ventilation. For the right ventricle, increased lung volume increases afterload. Right ventricular afterload increases because the pulmonary vascular resistance increases. The increased right ventricular afterload increases also because during lung inflation the right ventricle must pump blood through alveolar vessels (pulmonary capillaries), which are compressed by alveolar pressure.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.
You might also like to view...
You have been called for a 2-week-old male patient whose mother feels as though he is "sick." When assessing this patient and obtaining a history from the mother, which finding would be most concerning?
A) He has lost weight since he was born B) The fontanelles are lower than the level of the skull C) The father states that the baby feeds every 2 to 3 hours D) You observe that the baby seems to breathe only through his nose
What are three complications involving three body systems from which older persons with diabetes usually suffer?
What will be an ideal response?
Which of the following does not describe the gray matter of the spinal cord?
A. It is the inner part of the spinal cord. B. It contains neuron cell bodies. C. Its divisions are called horns. D. It contains myelinated axons. E. Its central canal contains CSF.
Kenneth Little is complaining of burning when he voids. Because you suspect he has a urinary tract infection, you ask him more questions about the appearance of the urine, how often he has the urge to urinate, if he has any hesitancy, and when the symptoms started. Which interviewing skill does this demonstrate?
A. Effective listening B. Awareness of nonverbal cues C. Broad knowledge base D. Summarizing to form a general picture E. Making the patient feel at ease