1. refers to the minimum amount of stimulus energy required to be detected 50% of the time. a. absolute threshold b. difference threshold c. just noticeable difference d. transduction

Absolute Threshold

Explanation:

The sensitivity of any given sensory system to the relevant stimuli can be expressed as an absolute threshold

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.