Cells of the can contract without chemical synapses because of junctions.

I think Cells of smooth muscles can contract without chemical synapsis because of gap junction.

Smooth muscles can contract without chemical stimulus because they are involuntry and are not under concious control.

And Gap junctions allow the exchange of ions, second messengers, and small metabolites between adjacent cells and are formed by two unrelated protein families, the pannexins and connexins.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

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