Advanced Dental Admission Test (ADAT)

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What is the location of A2 adrenergic receptors?

  1. Heart

  2. Presynaptic nerve terminals

  3. Vascular smooth muscle

  4. Adipose tissue

The correct answer is: Presynaptic nerve terminals

A2 adrenergic receptors are primarily located on presynaptic nerve terminals. These receptors play a crucial role in the autonomic nervous system by inhibiting the release of norepinephrine and other neurotransmitters when stimulated. This feedback mechanism helps to regulate neurotransmitter levels, preventing excessive neurotransmission. The presence of A2 adrenergic receptors at presynaptic sites contributes to the overall control of sympathetic outflow, influencing various physiological responses such as blood pressure regulation and modulation of neuronal activity. Understanding their location and function is essential for comprehending how adrenergic signaling affects multiple systems within the body.

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