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Multiple Choice
Which of the following receptors is considered a free dendritic ending?
A
tactile (Merkel) discs
B
tactile (Meissner's) corpuscles
C
lamellated (Pacinian) corpuscles
D
Golgi tendon organs
E
bulbous corpuscles (Ruffini endings)
Verified step by step guidance
1
Understand the concept of free dendritic endings: These are sensory receptors that have dendrites not enclosed in a capsule, allowing them to detect stimuli directly.
Identify the characteristics of each receptor type listed: tactile (Merkel) discs, tactile (Meissner's) corpuscles, lamellated (Pacinian) corpuscles, Golgi tendon organs, and bulbous corpuscles (Ruffini endings).
Recognize that tactile (Merkel) discs are known for being free nerve endings that are sensitive to light touch and pressure, typically found in the skin.
Differentiate between encapsulated and non-encapsulated receptors: Encapsulated receptors, like Meissner's and Pacinian corpuscles, have a connective tissue capsule, while free dendritic endings do not.
Conclude that tactile (Merkel) discs are the correct answer as they are the only option listed that are considered free dendritic endings.