A patient in a collaptoid state has been given an injection of mesatonum for the correction of blood pressure. What is the mechanism of this drug action?

Answer options

1. It stimulates a-adrenergic receptors
2. It blocks a-adrenergic receptors
3. It stimulates a- and 3-adrenergic receptors
4. It blocks 3-adrenergic receptors
5. It stimulates α-adrenergic receptors