Which of the following refers to the study of characteristics of natural drugs and their sources?

Which of the following is/are major mechanism(s) that contribute to the pulmonary hypertension commonly seen in a patient with a pulmonary embolism?

1. Decreased cross-section area of the pulmonary vascular system 2. Vasoconstriction induced by alveolar hypoxia 3. Reflexes from the aortic and carotid sinus baroreceptors 4. Vasoconstriction induced by humoral agents a. 1 b. 2, 3 c. 1, 2, 4 d. 1, 2, 3, 4

What are the most important substances transported into the tubules by means of secretion?

a. H+ and K+ c. Na+ and K+ b. H+ and Na+ d. glucose and water