Question

which of the receptor types shown here functions exclusively as a proprioceptor?
a
b (labeled with intrafusal fibers)
c
d
e (labeled with tactile epithelial cell)
options: b, c, d, all of the listed responses are correct.

Explanation:

Proprioceptors detect body position/movement. Option B (intrafusal fibers in muscle spindle) is a proprioceptor. A: free nerve endings (general sensory), C: tactile corpuscle (touch), D: lamellar corpuscle (pressure/vibration), E: tactile epithelial cell (touch). So B functions exclusively as proprioceptor.

Answer:

B. B