Sensing is the gathering of information related to an object of measurement by detecting data on characteristics such as sound, light, temperature, pressure, and flow and converting that data into signals using a sensor.
The ability of the pacemaker to recognize and respond to electrical activity in the heart. How the pacemaker responds to sensed signals depends on its programmed mode and parameters.
Sensory instrumentality is the means by which a living being comes to know its environment, its milieu. If the totality of a creature's environment is physical then its sensory apparatus will be limited to that alone, but if it is psychological and spiritual, then it will have the requisite mechanism to know the total dimensionality of its world.