20 Questions
Which receptor type does adrenaline (epinephrine) mainly act on in the heart?
β1 receptors
Which receptor type does noradrenaline (norepinephrine) predominantly stimulate in the blood vessels?
α1 receptors
Which receptor type plays a role in decreasing sympathetic outflow by acting as a negative feedback mechanism?
α2 receptors
Which type of receptor subtype is primarily responsible for vasodilation in the blood vessels?
β2 receptors
Which hormone is involved in the regulation of blood volume and pressure, and acts as an antagonist to the actions of the renin-angiotensin-aldosterone system (RAAS)?
Atrial Natriuretic Peptide (ANP)
Which receptor subtype mediates the direct pressor action of Angiotensin II on vascular smooth muscle?
α1 receptors in blood vessels
Which receptor subtype is primarily responsible for potentiation of sympathetic nervous system activity by Angiotensin II?
β1 receptors in the heart
Which of the following receptors is involved in the stimulation of aldosterone synthesis by Angiotensin II?
β1 receptors in the heart
Which receptor type is NOT directly associated with the physiological actions of Angiotensin II?
α2 receptors in peripheral circulation
Atrial Natriuretic Peptide (ANP) primarily exerts its effects through which type of receptor?
ANP receptors
Which receptor activation leads to an increase in the force and rate of cardiac contraction?
β1 receptor
Which receptors mediate vasoconstriction in blood vessels?
α2 receptors
Which peptide is released in response to an increase in extracellular fluid volume, leading to atrial wall stretch and regulation of blood volume and pressure?
Atrial Natriuretic Peptide (ANP)
Which type of nerve supply leads to vasodilatation in the genitalia?
Parasympathetic nerve supply
Which receptors, when activated, lead to vasodilatation in blood vessels?
β2 receptors
Which of the following receptors is responsible for causing constriction of large arteries and veins, and increasing the permeability of venules?
α1 receptors
Which autocoid is considered the most potent in pain responses, similar to histamine and serotonin?
Bradykinin
Which enzyme inactivates bradykinin, thus decreasing its physiological half-life?
Angiotensin-converting enzyme (ACE)
Which neurotransmitter contributes to inflammatory responses and also released from argentaffin cells in the intestine?
Serotonin
Which substance helps in controlling gastric acid secretion through H2 receptors?
Histamine
Test your knowledge on hormones such as antidiuretic hormone (ADH) and angiotensin (Ang) and their interactions with receptors in the body. Explore the functions of ADH in regulating thirst responses and Vasopressin in influencing blood pressure.
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