Among its other purposes, how is the Valsalva maneuver used?
To aid in defecation and urination
As part of the procedure for giving CPR to a person in respiratory arrest
To ventilate the lungs during eupnea
To expel more than the usual tidal volume from the lungs
To clear carbon monoxide from the body and replace it with oxygen
The Correct Answer is A
A. To aid in defecation and urination: This maneuver involves forced expiration against a closed glottis, which significantly increases intra-abdominal pressure. This pressure assists in the expulsion of abdominal contents during micturition, parturition, and defecation. It is a fundamental mechanical aid for these physiological processes.
B. As part of the procedure for giving CPR to a person in respiratory arrest: CPR requires active chest compressions and rescue breaths to maintain circulation and oxygenation. The Valsalva maneuver actually restricts venous return to the heart and would be counterproductive during resuscitation. It is not a component of emergency life support protocols.
C. To ventilate the lungs during eupnea: Eupnea refers to normal, quiet breathing, which relies on the rhythmic contraction of the diaphragm and external intercostals. The Valsalva maneuver involves a voluntary cessation of airflow and high thoracic pressure. It is an intentional interruption of the normal ventilatory cycle.
D. To expel more than the usual tidal volume from the lungs: The expulsion of air beyond the tidal volume is achieved through active exhalation using internal intercostals and abdominal muscles. During a Valsalva maneuver, no air is actually expelled because the glottis remains tightly closed. It creates pressure without air movement.
E. To clear carbon monoxide from the body and replace it with oxygen: Clearing carbon monoxide requires the administration of high-concentration oxygen to displace the toxin from hemoglobin. Increasing intrathoracic pressure via the Valsalva maneuver does not facilitate gas exchange or toxin displacement. It focuses on mechanical pressure rather than chemical detoxification.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Weeks: While some effector T cells have a short lifespan of only a few weeks during an active infection, memory cells are designed for long-term persistence. A lifespan limited to weeks would fail to provide the sustained protection required for secondary immune responses. Memory cells survive long after the pathogen is cleared.
B. Days: Effector lymphocytes often survive for only a few days after performing their cytotoxic or helper functions. This rapid turnover prevents chronic inflammation once a threat is eliminated. However, memory T cells are specifically differentiated to avoid this programmed cell death and remain viable for much longer.
C. Decades: Memory T cells are remarkably long-lived and can persist in the body for many decades, often for the entire life of the individual. This longevity ensures that the immune system can mount a rapid response if a pathogen is encountered again years later. They maintain the capacity for clonal expansion.
D. Years: Although memory T cells certainly last for years, this choice is less accurate than the broader clinical observation of their multi-decade persistence. Many vaccinations provide protection that lasts 20 to 50 years or more. Their survival is maintained through slow homeostatic proliferation without the need for antigen re-exposure.
E. months: A survival time of only a few months would necessitate frequent re-vaccination to maintain immunity against common childhood diseases. The physiological purpose of the memory T cell is to provide a semi-permanent record of past infections. Their lifespan significantly exceeds the scale of a few months.
Correct Answer is B
Explanation
A. Heme does not get converted into amino acids. Instead, heme is split into iron and a porphyrin ring. The iron is stored or reused, and the porphyrin ring is converted into biliverdin and then bilirubin for excretion. This pathway is completely different from protein hydrolysis.
B. Globin: The blue box leads to a pathway labeled “hydrolyzed to free amino acids.” This describes what happens to the globin portion of hemoglobin. Globin consists of protein chains, and when red blood cells are broken down, these protein chains are hydrolyzed into individual amino acids. The body then reuses these amino acids to build new proteins or for other metabolic functions. Therefore, box 2 represents globin.
C. Erythropoietin is not part of hemoglobin structure. It is a hormone that regulates red blood cell production. It is not broken down during
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