When epinephrine binds to β2-adrenergic receptors on smooth muscle cells, it leads to smooth muscle relaxation. When acetylcholine (ACh) binds to muscarinic receptors on smooth muscle cells, it leads to smooth muscle contraction. This is an example of ________________. A. receptor antagonism B. receptor agonism C. tonic control D. antagonistic control E. competition F. saturation
Added by Marwa A.
Step 1
Step 1: Epinephrine binds to β2-adrenergic receptors on smooth muscle cells, leading to smooth muscle relaxation (vasodilation). Show more…
Show all steps
Your feedback will help us improve your experience
Rabeya Zahid and 91 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Epinephrine binds to both $\beta$ -adrenergic and $\alpha$ -adrenergic receptors. Describe the opposite actions on the effector protein, adenylyl cyclase, elicited by the binding of epinephrine to these two types of receptors. Describe the effect of adding an agonist or antagonist to a $\beta$ -adrenergic receptor on the activity of adenylyl cyclase.
In smooth muscle, the neurotransmitter norepinephrine and hormone epinephrine modulate muscle contraction or relaxation; generally via acting on ̑-AR and ̢-AR (Adrenergic Receptors). Each of these receptors is a G-protein coupled receptor (GPCR). A) Stimulation of ̑-AR elevates IP3 levels which causes muscle contraction and vasoconstriction. What type of GPCR is the ̑-AR? Describe the mechanism by which ̑-AR ligand binding leads to elevation in IP3 levels.
Sri K.
In order to cause vasodilation of most vascular smooth muscle, norepinephrine combines with alpha receptors. Signaling at alpha receptors is decreased when acetylcholine combines with muscarinic receptors. Signaling at beta receptors is increased. Muscarinic receptor signaling increases.
Adi S.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD