Type I cutaneous mechanoreceptor (Merkel disc), Type II cutaneous mechanoreceptor (Ruffini corpuscle), thermoreceptor, muscle spindles are the receptors fires continuously as long as a stimulation is applied. Thus, option b, f, g, h are correct.
what are the role of receptors?
Receptors are the sensing protein molecule which bind to specific molecule in cell called as ligand.
The ligand can be a drug or any endogenous molecule like neurotransmitters, hormones, etc.
Based on molecular structure and mode of action four major types of receptors are found such as G-protein coupled receptors, ligand-gated ion channel receptors, Nuclear receptors, Kinase-linked receptors
Almost all the receptors have endogenous ligands such serotonin, acetylcholine etc.
Hence, option b, f, g, h are correct.
Learn more about receptor, here:
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Your question was incomplete. Hence the probable question was
Which receptor fires continuously as long as a stimulation is applied? Select all that apply.
a) Corpuscle of touch (Meissner corpuscle)
b) Type I cutaneous mechanoreceptor (Merkel disc)
c) Lamellated (Pacinian) corpuscle
d) Hair root receptor
e) Photoreceptor
f) Type II cutaneous mechanoreceptor (Ruffini corpuscle)
g) thermoreceptor
h) muscle spindles