Autocoids Quiz

What is the definition of autocoids?

• Substances produced in one part of an organism and transported to another part to exert a physiological effect

• Substances that have no physiological effects

• Substances produced in the brain to regulate temperature

• Substances that act as global hormones with long duration

Which of the following is NOT a type of autocoid?

• Eicosanoids

• Insulin

• Histamine

• Serotonin

Where are H2 histamine receptors located?

• Gastric glands, blood vessels, heart

• Smooth muscle, blood vessels, nerve endings

• Central nervous system, lungs, gastric mucosa

• Hematopoietic cells

What is the main pharmacological effect of H1 histamine receptors?

• Decrease in blood pressure

• Release of CAs from adrenal medulla

• Stimulation of nerve endings

• Contraction of smooth muscle

What is the clinical use of H2 receptor antagonists?

• Treatment of allergic reactions

• Treatment of peptic ulcers and duodenal disease

• Preventing motion sickness

• Inducing sedation and hypnotics

What is the mechanism of action of H1 receptor antagonists?

• Inhibition of histamine release

• Activation of histamine receptors

• Blockade of histamine receptors

• Enhancement of histamine synthesis

Which of the following is a characteristic of H2 histamine receptors?

• Primarily located in the central nervous system

• Activation leads to smooth muscle contraction

• Stimulation results in gastric acid secretion

• Associated with allergic reactions

What is the primary function of H3 histamine receptors?

• Regulation of blood pressure

• Inhibition of histamine release

• Induction of smooth muscle contraction

• Enhancement of allergic responses