The concentration of carbon dioxide in the earth's atmosphere is

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Question 1 of 5

The concentration of carbon dioxide in the earth's atmosphere is

Correct Answer: B

Rationale: The correct answer is B (0.04 percent) because the concentration of carbon dioxide in the Earth's atmosphere is around 400 parts per million (ppm), which is equivalent to 0.04 percent. This concentration is widely accepted by scientific research and measurements. Choice A (0.004 percent) is too low and doesn't accurately reflect the actual concentration. Choice C (0.4 percent) and choice D (4.0 percent) are both too high, which are significantly above the current levels of carbon dioxide in the atmosphere. Therefore, B is the correct choice as it aligns with the established scientific data on carbon dioxide concentration in the atmosphere.

Question 2 of 5

In mammals ventilation movements of lungs are governed by

Correct Answer: D

Rationale: The correct answer is D: Diaphragm and intercostal muscles. The diaphragm is the primary muscle responsible for inhalation and exhalation by contracting and relaxing, respectively. Intercostal muscles aid in expanding and contracting the rib cage to assist in breathing. The combination of the diaphragm and intercostal muscles working together ensures efficient ventilation of the lungs in mammals. Choices A and B are incorrect because the muscular wall of the lungs and intercostal muscles alone are not solely responsible for regulating ventilation. Choice C is incorrect because the diaphragm alone does not govern ventilation movements without the assistance of the intercostal muscles. Therefore, the correct answer is D as it accurately reflects the coordinated effort of both the diaphragm and intercostal muscles in regulating lung ventilation.

Question 3 of 5

Rate and depth of respiration shall increase when

Correct Answer: B

Rationale: The correct answer is B: CO2 concentration increases. When CO2 levels rise in the blood, it leads to an increase in the acidity of the blood, triggering the respiratory centers in the brain to increase the rate and depth of respiration in order to expel excess CO2 and restore the pH balance. Explanation for other choices: A: Oxygen concentration increases - An increase in oxygen concentration does not directly stimulate an increase in respiration rate or depth. The respiratory drive is primarily regulated by CO2 levels. C: Bicarbonate concentration increases - While bicarbonate is involved in the acid-base balance in the body, it does not directly influence the rate and depth of respiration. D: Bicarbonate concentration decreases - A decrease in bicarbonate concentration may affect acid-base balance, but it does not have a direct effect on respiratory rate and depth.

Question 4 of 5

A nurse is assessing a client who is recovering from a lung biopsy. The client's breath sounds are absent. While another nurse calls the Rapid Response Team

Correct Answer: B

Rationale: The correct answer is B, taking a full set of vital signs, as it is crucial in assessing the client's overall condition and detecting any signs of deterioration. Vital signs include blood pressure, heart rate, respiratory rate, and temperature, which provide valuable information about the client's cardiovascular and respiratory status. In this scenario, absent breath sounds indicate potential respiratory compromise, making it essential to monitor vital signs for any signs of respiratory distress or instability. Choice A is incorrect because calling the Rapid Response Team is important, but assessing the client's vital signs should take priority to provide immediate information on the client's condition. Choice C, obtaining pulse oximetry reading, is also important but may not provide a comprehensive assessment of the client's overall condition compared to a full set of vital signs. Choice D, asking about hemoptysis, is not the most urgent action to take in this situation as assessing vital signs would provide more immediate and critical information for the client's management.

Question 5 of 5

A nurse is teaching a client about possible complications and hazards of home oxygen therapy. About which complications doesn't the nurse plan to teach the client?

Correct Answer: D

Rationale: The correct answer is D - Alveolar recruitment. This is because alveolar recruitment is actually a benefit of home oxygen therapy, not a complication. It helps improve oxygenation by opening up collapsed alveoli. A - Absorptive atelectasis is a potential complication where nitrogen is absorbed from the alveoli leading to collapse. B - Combustion is a hazard due to oxygen's flammability. C - Dried mucous membranes is a common complication of oxygen therapy due to the drying effect of oxygen.

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