Nokea
smoking is one of the cause of
- A. hypoxia
- B. cancer
- C. emphysema
- D. macrosis
Correct Answer: C
Rationale: The correct answer is C: emphysema. Smoking is a leading cause of emphysema due to the damage it causes to the air sacs in the lungs. This damage leads to decreased lung function, shortness of breath, and other respiratory problems. Hypoxia (choice A) is a condition of low oxygen levels in tissues, not directly caused by smoking. Cancer (choice B) is also linked to smoking, but emphysema is specifically associated with lung damage. Macrosis (choice D) is not a recognized medical condition related to smoking or any other factor.
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A 92-year-old female patient is being admitted to the emergency department with severe shortness of breath. Being aware of the patient’s condition, what approach should the nurse use to assess the patient’s lungs?
- A. Apex to base
- B. Base to apex
- C. Lateral sequence
- D. Anterior then posterior
Correct Answer: D
Rationale: In a patient with severe shortness of breath, the nurse should assess the lungs using a posterior to anterior approach to minimize discomfort and optimize assessment in compromised patients.
Myoglobin is a muscle hemoglobin which exhibits Hyperbolic oxygen dissociation curve indicating its great affinity towards Oxygen (Non-cooperative binding). The Hyperbolic nature of the curve is due to
- A. Single polypeptide (153 amino acids) and Monomeric nature
- B. High concentration in the muscle
- C. Muscle protein
- D. Quarternary structure
Correct Answer: A
Rationale: Step-by-step rationale for choice A being correct:
1. Myoglobin is composed of a single polypeptide chain with 153 amino acids, making it monomeric.
2. Being monomeric, myoglobin does not exhibit cooperative binding, leading to a hyperbolic oxygen dissociation curve.
3. The lack of multiple subunits in myoglobin results in non-cooperative binding and a hyperbolic curve.
4. The monomeric nature allows myoglobin to have a simple structure, enhancing its affinity for oxygen.
Summary of why other choices are incorrect:
B: High concentration in the muscle does not directly explain the hyperbolic curve.
C: Being a muscle protein does not inherently determine the hyperbolic nature of the oxygen dissociation curve.
D: Quaternary structure would involve multiple subunits, leading to cooperative binding and a sigmoidal oxygen dissociation curve.
Which of the following anatomical structures is not part of the conducting zone?
- A. pharynx
- B. nasal cavity
- C. alveoli
- D. bronchi
Correct Answer: C
Rationale: The correct answer is C: alveoli. The conducting zone of the respiratory system includes structures that transport air to and from the gas exchange sites. Alveoli are the primary sites of gas exchange, not part of the conducting zone. Pharynx (A), nasal cavity (B), and bronchi (D) are all part of the conducting zone as they help in air transportation but do not directly participate in gas exchange like alveoli do. Therefore, alveoli is the correct answer as it does not belong to the conducting zone.
A nurse observes that a client's anteroposterior (AP) chest diameter is the same as the lateral chest diameter. Which question would the nurse ask the client in response to this finding?
- A. Are you taking any medications or herbal supplements?
- B. Do you have any chronic breathing problems?
- C. How often do you perform aerobic exercise?
- D. What is your occupation and what are your hobbies?
Correct Answer: B
Rationale: The correct answer is B: Do you have any chronic breathing problems? This question is appropriate because equal AP and lateral chest diameters could indicate barrel chest, which is often associated with chronic obstructive pulmonary disease (COPD) or other chronic breathing problems. Asking about chronic breathing problems can help the nurse further assess the client's respiratory health.
Incorrect answers:
A: Are you taking any medications or herbal supplements? This question is not directly related to the observed chest diameter findings.
C: How often do you perform aerobic exercise? This question is not relevant to the physical assessment findings and does not address the potential respiratory issue.
D: What is your occupation and what are your hobbies? This question does not directly address the equal AP and lateral chest diameters and does not help in assessing the respiratory status of the client.
At high altitudes all of the following things occur in an effort to acclimatise EXCEPT
- A. Hypoventilation
- B. Polycythaemia
- C. Increased numbers of capillaries per unit volume in peripheral tissues
- D. O2 dissociation curve shifts to right
Correct Answer: A
Rationale: The correct answer is A: Hypoventilation. At high altitudes, the body adapts to the decreased oxygen availability by increasing red blood cell production (polycythaemia) to enhance oxygen-carrying capacity. This is supported by the shift of the oxygen dissociation curve to the right, facilitating oxygen unloading in tissues. Additionally, increased capillaries in peripheral tissues improve oxygen delivery. However, hypoventilation, or decreased breathing rate, is not a typical response to high altitudes. In fact, the body usually compensates by increasing ventilation to maintain adequate oxygen levels.