What term is used to describe the absence of breathing?

What term is used to describe the absence of breathing?
 
  a. Orthopnea
  b. Platypnea
  c. Eupnea
  d. Apnea

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Q. 2  A 23-year-old patient enters the emergency room complaining of dyspnea.
 
  The RT places the patient on oxygen as per hospital protocol and begins to interview the patient about her symptoms. She states that she is having difficulty taking a breath with chest tightness. Patient has a respiratory rate of 28 breaths/min with a loose productive cough. During ausculta-tion, the RT hears bilateral wheezing in the lungs. What is the most likely cause of the patient's symptoms?
  a. Asthma
  b. Bronchitis
  c. Congestive heart failure
  d. Emphysema

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Q. 3  Which of the following are formed elements in the blood? 1. Leukocytes 2. Erythrocytes 3. Thrombocytes 4. Electrolytes
 
  a. 1 and 2 only
  b. 1, 2, and 3 only
  c. 2, 3, and 4 only
  d. 1, 2, and 4 only

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Q. 4  During examination of a patient's extremities, you press firmly for a brief period on a fingernail.
 
  You observe that it takes approximately 5 sec for the color to return to the nail bed. This finding is most consistent with which of the following?
  a. Reduction in cardiac output or poor pe-ripheral perfusion
  b. Presence of a disorder causing chronic hypoxemia
  c. Reduction in venous return to the right side of the heart
  d. Presence of a disorder causing systemic hypertension