QuestionSBA
QuestionChoice
Tyrosine Kinase receptors act within minutes to hours. They are involved in cell to cell communication and a wide range of biological functions. By contrast, GPCR signalling is much faster than this, acting within seconds.
10007028
c
Minutes to hours
QuestionChoice
GPCRs are membrane proteins used to convert extracellular information into a cellular response. They act within seconds, as is necessary for functions like vision, taste, and olfaction.
10007026
a
Seconds
QuestionChoice
Although ion channels act within milliseconds, GPCR signalling is slightly slower. The rapid action of ion channel signalling is necessary for muscle contraction in the skeletal muscle and cardiac muscle.
10007027
b
Milliseconds
QuestionChoice
GPCR signalling occurs within seconds.
10007030
e
Days
QuestionChoice
Nuclear receptors act within hours. These are activated by steroid hormones and other signals, which are found inside the cell. By contrast, GPCR signalling is much faster than this, acting within seconds.
10007029
d
Hours
Concept
Chapter
2693
4561
G protein-coupled receptors
Topic
166
General pharmacological concepts
13952
Intracellular signalling can take a variety of forms. In G-protein coupled receptors (GPCRs), activation of a cell surface receptor causes a cellular response through activation of a G-protein.

Which of the following best describes the speed of action of a GPCR?
a