Nokea
Foetal hemoglobin has great affinity than adult hemoglobin because
- A. It binds 2,3 DPG less avidity by Gamma polypeptide chain than HbA
- B. Its concentration is very high
- C. Foetal blood gets oxygen from the mother
- D. Its polypetide chains bind very fast with Oxygen
Correct Answer: A
Rationale: The correct answer is A because 2,3 DPG binds less avidly to the Gamma polypeptide chain in foetal hemoglobin, resulting in a higher affinity for oxygen. This is due to structural differences between foetal and adult hemoglobin. Choice B is incorrect as high concentration alone does not determine affinity. Choice C is incorrect as the source of oxygen does not affect hemoglobin's affinity. Choice D is incorrect as the speed of oxygen binding does not necessarily correlate with affinity.
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Carina is the point where ...... divided
- A. Trachea
- B. bronchi
- C. larynx
- D. none of them
Correct Answer: A
Rationale: The correct answer is A: Trachea. Carina is the point where the trachea is divided into the left and right primary bronchi. This anatomical landmark is located at the lower end of the trachea where it bifurcates into the bronchi. The other choices, B: bronchi and C: larynx, are incorrect because the trachea is the structure that is divided at the carina, not the bronchi or larynx. Choice D: none of them is also incorrect because the trachea is indeed divided at the carina. Therefore, the correct answer is A as it accurately describes the anatomical location where the trachea divides.
Which phrase is used to describe the volume of air inspired and expired with a normal breath?
- A. Total lung capacity
- B. Forced vital capacity
- C. Tidal volume
- D. Residual volume
Correct Answer: C
Rationale: The correct answer is C: Tidal volume. Tidal volume refers to the volume of air inspired and expired during a normal breath. It represents the amount of air moved into or out of the lungs during each respiratory cycle, which typically ranges from 500 to 700 milliliters in adults. Total lung capacity (A) is the maximum volume of air the lungs can hold, including residual volume. Forced vital capacity (B) is the maximum amount of air that can be forcefully exhaled after a maximum inhalation, not related to a normal breath. Residual volume (D) is the volume of air remaining in the lungs after a maximal exhalation and is not part of a normal breath cycle.
The client with which of the following types of lung cancer metastasizes quickly?
- A. Adenocarcinoma
- B. Oat cell
- C. Squamous cell
- D. Bronchial carcinoids
Correct Answer: B
Rationale: The correct answer is B: Oat cell. Oat cell (small cell) lung cancer metastasizes quickly due to its aggressive nature, high growth rate, and early dissemination to distant sites. This type of cancer is known for its rapid spread to other organs, leading to poor prognosis. Adenocarcinoma, squamous cell, and bronchial carcinoids have a slower metastatic rate compared to oat cell lung cancer. Adenocarcinoma tends to metastasize to the lymph nodes and other organs over time, while squamous cell typically spreads locally within the lung tissue. Bronchial carcinoids are slow-growing tumors with a lower propensity for rapid metastasis compared to oat cell lung cancer.
Most of the oxygen transported by the blood is
- A. dissolved in plasma
- B. bound to hemoglobin
- C. in ionic form as solute in the plasma
- D. bound to the same protein as carbon dioxide
Correct Answer: B
Rationale: The correct answer is B: bound to hemoglobin. This is because hemoglobin is the protein in red blood cells that carries oxygen from the lungs to tissues throughout the body. Oxygen binds to the iron atoms in hemoglobin, forming oxyhemoglobin. This accounts for the majority of oxygen transport in the blood.
A: Dissolved in plasma is incorrect as only a small fraction of oxygen is carried this way.
C: In ionic form as a solute in plasma is incorrect as oxygen is not typically found in ionic form in the blood.
D: Bound to the same protein as carbon dioxide is incorrect as oxygen binds to hemoglobin, while carbon dioxide primarily binds to different proteins such as carbonic anhydrase.
The cessation of smoking
- A. can reduce the risk of stillbirth
- B. reduces the chances of cancer
- C. reduces the chances of coronary disease
- D. all of the above
Correct Answer: D
Rationale: The correct answer is D, all of the above. Cessation of smoking reduces the risk of stillbirth by improving fetal health. It also reduces the chances of cancer by decreasing exposure to carcinogens. Additionally, quitting smoking decreases the risk of coronary disease by improving heart health. Therefore, all the choices are correct as they highlight different positive outcomes of quitting smoking.