QuestionSBA
QuestionChoice
These are mainly found in blood vessels and the bladder. When activated, they cause vasoconstriction, raised blood pressure and closure of bladder sphincters.
10005583
c
Alpha-1 adrenergic receptors
QuestionChoice
These are located at skeletal muscle neuromuscular junctions. Stimulation causes muscle excitation.
10005584
d
Nicotinic acetylcholine receptors
QuestionChoice
These are located in the heart, and increase heart rate and contractility when activated.
10005582
b
Beta-1 adrenergic receptors
QuestionChoice
These are located in smooth muscles, cardiac muscle and glands. They cause bronchoconstriction in the lungs when activated.
10005585
e
Muscarinic acetylcholine receptors
QuestionChoice
These receptors are located in the bronchioles. Activation of them causes bronchodilation. The location of beta-1 and beta-2 adrenergic receptors can be remembered by the fact that beta-1 receptors are located in the heart, and humans have one heart. However, beta-2 receptors are located in the lungs, and humans have two lungs.
10005581
a
Beta-2 adrenergic receptors
Concept
Chapter
2693
3723
Asthma in children
Topic
132
Respiratory
13663
A 10-year-old girl presents with an acute asthma attack. She is given back-to-back salbutamol nebulisers to open up her airways.

Which of the following receptors does salbutamol act on?
a