Which of the following is not true for histamine ?

Related Mcqs:

1. Which of the following histamine blockers has no effect on muscarinic receptors______________?

   A. Diphenydramine B. Promethazine C. Terfenadine D. Pyrilamine...

2. Histamine is present on surface of_______________?

   A. Lymphocytes B. Mast cells C. Neutrophils D. Erythrocytes...

3. Histamine stimulate the secretion of_______________?

   A. Gastrin by stomach B. Pancreatic enzymes C. HCL by stomach D. Amylase by salivary gland...

4. Histidine is converted to histamine by_____________?

   A. Transamination B. Hydroxylation C. Decarboxylation D. Reduction...

5. The immediate type of hypersensitivity in which histamine doses not play a major role is______________?

   A. Urticaria B. Asthma C. Anaphylaxis D. Arthus reaction...

6. All of the following are true except____________?

   A. A special application of dantrolene is used to treat malignant hyperthermia B. Interferons have a role in immunology of cancer C. Thalidomide is used for the treatment of leprosy D. Allopurinol is a derivative of 8-mercaptopurine...

7. Which of the following is true for carbonic anhydrase inhibitor ?

   A. It causes excertion of Na & Cl B. It is used as an adjunct in epilepsy C. It is very potent D. It causes metabolic alkalosis...

8. The following statements about verapamil are true except_____________?

   A. It does not produce reflex tachycardia B. It is less potent as a coronary vasodilator C. It is contraindicated in patients with supraventicular tachycardia D. It can cause constipation...

9. Which of the following statements regarding nitroglycerin is true ?

   A. The effect is more pronounced in venous B. High membrane penetrability C. Poorly suited for oral administration D. All of the above...

10. All of the following statements regarding biovailability of a drug are true except______________?

    A. It is the proportion (fraction) of unchanged drug that reaches the systemic circulation B. Biovailability of an orally administered drug can be calculated by comparing the area under cure (o-a) after oral and intravenous (IV) administration C. Low oral biovailability always and necessarily mean poor absorption D. Biovailability can be determined from plasma concentration...