Which of the following is TRUE regarding hemoglobin?

Which of the following is TRUE regarding hemoglobin?
 
  A) It contains proteins such as albumin and antibodies.
  B) It can carry two oxygen molecules at a time.
  C) It is a molecule that consists of protein and iron.
  D) It has a greater affinity for oxygen than carbon monoxide.

Question 2

You are called for a patient who has received an electrical shock. When you arrive, you find that the patient has struck a power pole with a motorcycle and has a power line lying across him. Which of the following components of the scene size-up is particularly relevant at this point?
 
  A) Number of patients
  B) Mechanism of injury
  C) Additional resources
  D) General impression

Question 3

Which one of the following statements about the circulation of blood is TRUE?
 
  A) Pulmonary arteries are the only arteries that carry oxygenated blood.
  B) The right myocardium is thicker than the left myocardium.
  C) The right atrium receives oxygenated blood from the vena cava.
  D) The left atrium sends oxygenated blood into the left ventricle.