Question

which of the following statements is true of coumarin? a) the lab test to measure action is activated partial thromboplastin time (aptt). b) its antidote is vitamin k. c) the medication may only be administered parenterally. d) its onset of action is immediate. question 20 (2.5 points) which of the following best describes the location of the apex of the heart? a) it lies on the diaphragm and points to the left of the body. b) it is located over the atria.

Explanation:

1. For the coumarin question:

• The lab - test to measure the action of coumarin is prothrombin time (PT) or international normalized ratio (INR), not aPTT, so option a is incorrect.
• Vitamin K is the antidote for coumarin as coumarin inhibits vitamin - K dependent clotting factors, so option b is correct.
• Coumarin can be administered orally, not only parenterally, so option c is incorrect.
• The onset of action of coumarin is not immediate; it takes several hours to days, so option d is incorrect.

1. For the heart - apex location question:

• The apex of the heart lies on the diaphragm and points to the left of the body. The atria are the upper chambers of the heart and the apex is not located over them. So option a is correct for the heart - apex location.

Answer:

1. b) Its antidote is vitamin K.
2. a) It lies on the diaphragm and points to the left of the body.