18 Questions
Which hormone is one of the most potent vasoconstrictor substances?
Angiotensin II
What is the primary site of formation for vasopressin (ADH)?
Hypothalamus
Which receptor opposes the pressor actions of the AT1 receptor?
AT2 receptor
Which component constitutes 80% of the hormones produced by the adrenal medulla?
Adrenaline
When is vasopressin (ADH) released into circulation?
During dehydration
Which hormone reduces urine formation by the kidney?
Aldosterone
What is the main physiological action of angiotensin II through AT1 receptors?
Direct pressor action via receptors on vascular smooth muscle
Which hormone increases sodium and water reabsorption from the kidney?
Aldosterone
What is the enzyme responsible for converting angiotensin I to angiotensin II in the lungs?
ACE (angiotensin-converting enzyme)
Which of the following is NOT a physiological action of angiotensin II through AT1 receptors?
Direct inhibition of aldosterone synthesis
Which hormone is secreted by the kidney in response to low arterial pressure or reduced extracellular fluid volume?
Renin
What is the main effect of aldosterone on the kidney?
Increases sodium and water reabsorption
Which vasoconstrictor is responsible for causing hypotension and anaphylactic shock in severe conditions?
Bradykinin
Which endothelial vasoconstrictor contributes to inflammatory responses and increases the permeability of venules?
Serotonin
Which molecule inactivates bradykinin in the body, decreasing its physiological half-life?
Angiotensin II
Which neurotransmitter acts as a vasodilator, increasing capillary permeability and attracting leucocytes?
Bradykinin
Which vasoconstrictor is responsible for causing constriction of large arteries and veins?
Serotonin
Which molecule plays a role in the local regulation of blood flow when released from argentaffin cells in the intestine?
Serotonin
Test your knowledge on the effects of antidiuretic hormone and angiotensin peptides in the body. Learn about how ADH affects thirst responses and how Ang II and its related peptides function in the body.
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