In the knee jerk reflex shown in the figure, which of the following components of the reflex arc serves as the sensory receptor? 
Definitions:
Prosperity
A state of economic well-being and success, often measured by levels of wealth, employment, and quality of life.
Amino Acid
Organic compounds that serve as the building blocks of proteins, containing both amino and carboxyl functional groups.
Letter Symbol
A character used to represent an element or compound in chemical equations.
Amino Acid
Organic compounds that combine to form proteins, containing an amino group and a carboxylic acid group, serving as the building blocks of proteins.
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