Smooth Muscle

Concept: Intro to Smooth Muscle

5m

Concept: Smooth Muscle Excitation-Contraction Coupling

6m

Concept: Control of Smooth Muscle Contraction-- Smooth Muscle "Action Potentials"

4m

Concept: Hormonal Control of Smooth Muscle

2m

Problem: Phenylephrine is a drug that activates α1 adrenergic receptors on smooth muscle. Activation of α1 adrenergic receptors starts a signaling cascade that increases the activity of Ca2+ channels and myosin light chain kinase (MLCK). Which of the following is the likely effect of phenylephrine on smooth muscle?

2m

Problem: Albuterol is a drug that activates β2 adrenergic receptors on smooth muscle. Activation of β2 adrenergic receptors starts a signaling cascade that, among other things, increases the activity of K+ channels in the membranes of smooth muscle cells. Which of the following is the likely effect of albuterol on smooth muscle?

2m