List three types of sympathetic (adrenergic) receptor sites. ...

[jho37]

List three types of sympathetic (adrenergic) receptor sites.
 
  What will be an ideal response?

Question 2

_____ cells are working cells of the heart that contain contractile filaments and form the muscular layer of the atrial walls and the thicker muscular layer of the ventricular walls.
 
  a. Pacemaker
  b. Myocardial
  c. Specialized
  d. Electrical

[akpaschal]

Answer to Question 1

There are five main types of sympathetic (adrenergic) receptors: alpha1, alpha2, beta1, beta2, and dopamine (or dopaminergic).

Answer to Question 2

B
Myocardial cells (working or mechanical cells) contain contractile filaments. When these cells are electrically stimulated, the contractile filaments slide together, and the myocardial cell contracts.