Receptors of the heart
Think: "2 Beautiful hearts Marry 2 Be 1"
- B2 receptor (adrenergic)
- M2 receptor (cholinergic) and
- B1 receptor (adrenergic)
(B1 receptors are present in heart and JG cells of the kidney and B2 receptors in heart and smooth muscles.)
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Did you know?
 The heart is innervated by both sympathetic (adrenergic) and parasympathetic (cholinergic) fibres. |
| Adrenergic nerves from cervical sympathetic chain exerts positive ionotropic (contractility) and chronotropic (heart rate) effects on heart through B1 receptors. |
| B2 receptors are more in smooth muscles of vessel walls and thus mediate vasodilatation. |
| Parasympathetic fibres which reach the heart through the vagus nerves have inhibitory effect on the heart through M2 receptors and is responsible for decreasing heart rate, conduction (dromotropic) and contractility. |
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