Which compensatory mechanism is spontaneously used by

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Essentials of Human Development: A Life-Span View
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Chapter 2 / Exercise 4
Essentials of Human Development: A Life-Span View
Cavanaugh/Kail
Expert Verified
14.Which compensatory mechanism is spontaneously used by children diagnosed with tetralogy of Fallot to relieve hypoxic spells?a.Lying on their left sidec.Squattingb.Performing the Valsalva maneuverd.HyperventilatingANS: CSquatting is a spontaneous compensatory mechanism used by older children to alleviate hypoxic spells. Squatting and its variants increase systemic resistance while decreasing venous return to the heart from the inferior vena cava. The other options would not result in these changes.
15.An infant diagnosed with a small patent ductus arteriosus (PDA) would likely exhibit which symptom?
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Essentials of Human Development: A Life-Span View
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Chapter 2 / Exercise 4
Essentials of Human Development: A Life-Span View
Cavanaugh/Kail
Expert Verified
16.What is the most common cause of chronic sustained hypertension observed only in a newborn?
17.Which condition is consistent with the cardiac defect of transposition of the great vessels?
18.Which scenario describes total anomalous pulmonary venous return?a.The foramen ovale closes after birth.b.Pulmonary venous return is to the right atrium.c.Pulmonary venous return is to the left atrium.d.The left atrium receives oxygenated blood.ANS: BTotal anomalous pulmonary venous return occurs when the pulmonary veins abnormally connect to the right side of the heart either directly or through one or more systemic veins that drain into the right atrium. None of the other options accurately describe the presentation of a total anomalous pulmonary venous return.

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