Nokea
During transportation of Carbon dioxide, blood will not become acidic, because
- A. It contains hemoglobin
- B. It contains Hemoglobinc acid
- C. It contains Buffers
- D. It contains high CO2
Correct Answer: C
Rationale: Rationale: Choice C is correct because blood contains buffers like bicarbonate that help maintain pH balance by neutralizing excess acids or bases. This prevents blood from becoming acidic during CO2 transportation. Choices A and B are incorrect as hemoglobin doesn't directly regulate blood pH, and hemoglobinc acid is not a component in blood. Choice D is incorrect as high CO2 levels can actually lead to blood becoming more acidic if not properly buffered.
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Fick's law of diffusion is related to
- A. Diffusion and Surface area
- B. Diffusion and membrane potential
- C. Diffusion and water content
- D. Diffusion and pore diameter
Correct Answer: A
Rationale: Fick's law of diffusion states that the rate of diffusion is directly proportional to the surface area and concentration gradient, and inversely proportional to the distance over which diffusion occurs. Therefore, Choice A - Diffusion and Surface area is correct because surface area directly affects the rate of diffusion. Choices B, C, and D are incorrect as they do not directly relate to Fick's law. B is incorrect as membrane potential is not a factor in Fick's law. C is incorrect as water content is not a key factor in the law of diffusion. D is incorrect as pore diameter is not explicitly mentioned in Fick's law.
A nurse is working in a walk-in clinic. She has been alerted that there is an outbreak of tuberculosis (TB). Which of the following clients entering the clinic today is most likely to have TB?
- A. A 16-year-old female high school student
- B. A 33-year-old day-care worker.
- C. A 43-year-old homeless man with a history of alcoholism.
- D. A 54-year-old businessman.
Correct Answer: C
Rationale: The correct answer is C, a 43-year-old homeless man with a history of alcoholism. This choice is most likely to have TB because individuals who are homeless and have a history of alcoholism are at higher risk for TB due to weakened immune systems and living conditions. Homelessness and alcoholism increase the likelihood of exposure to TB.
Explanation for other choices:
A: A 16-year-old female high school student - Less likely to have TB compared to homeless individuals with risk factors.
B: A 33-year-old day-care worker - Possible but less likely compared to the homeless man with a history of alcoholism.
D: A 54-year-old businessman - Least likely to have TB compared to the homeless individual with risk factors.
Which of these factors does not affect hemoglobin's affinity for oxygen?
- A. RBC metabolic activity
- B. temperature
- C. electrolyte balance
- D. the PO2 of blood
Correct Answer: C
Rationale: The correct answer is C: electrolyte balance. Hemoglobin's affinity for oxygen is primarily influenced by factors such as pH, temperature, and the partial pressure of oxygen (PO2). Electrolyte balance, on the other hand, does not directly impact hemoglobin's ability to bind with oxygen. Changes in electrolyte levels may affect overall blood composition but do not directly alter hemoglobin's oxygen-binding capacity. Therefore, electrolyte balance does not affect hemoglobin's affinity for oxygen, making it the correct choice. RBC metabolic activity can impact oxygen release from hemoglobin, temperature can affect hemoglobin's oxygen-binding capacity, and the PO2 of blood directly influences oxygen binding to hemoglobin.
The organ of the respiratory system that traps bacteria with a ring of tonsils is the:
- A. nose
- B. pharynx
- C. larynx
- D. trachea
Correct Answer: B
Rationale: The correct answer is B: pharynx. The pharynx is the organ that traps bacteria with its tonsils. The tonsils are located in the pharynx and act as the body's first line of defense against pathogens entering the respiratory system. The nose (choice A) is responsible for warming, humidifying, and filtering air, but it does not trap bacteria with tonsils. The larynx (choice C) is involved in sound production and preventing food from entering the airway, not trapping bacteria. The trachea (choice D) is the windpipe that carries air to and from the lungs, but it does not have tonsils to trap bacteria.
The partial pressure of carbon dioxide in venous blood is approximately
- A. 40 mm Hg
- B. 45 mm Hg
- C. 50 mm Hg
- D. 70 mm Hg
Correct Answer: B
Rationale: The correct answer is B (45 mm Hg) because the partial pressure of carbon dioxide in venous blood is typically around 40-45 mm Hg. This value represents the amount of CO2 dissolved in the blood plasma. Option A (40 mm Hg) is slightly on the lower side and may not fully reflect the average value. Option C (50 mm Hg) is higher than the usual range for venous blood CO2 levels. Option D (70 mm Hg) is significantly higher than the normal range and is more characteristic of arterial blood CO2 levels. Therefore, option B is the most accurate representation of the partial pressure of CO2 in venous blood.