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Of course, you are more complicated than a heater. For one thing, you have many different things to detect and send info about to the CNS or other control center. In addition, there are a variety of possible responses and two basic response systems.

Sensors

Control centerÆperipheral tissues (often CNS)commands

Æ info

A. Sensory receptors (sensors)49.1 Q. Consider the largest organ in your body, your skin; what kinds of things can you detect with sensorsin your skin? - heat, cold, pain, pressure, movement of hairs On the outline is a list of different types of "sensors": (At this point, don't worry about howthey work, just think about the types of information they send to the CNS or other control center). 1. Mechanoreceptors Mechanoreceptorsdetect pressure, touch, stretch, motion, sound (vibrations) 2. Chemoreceptors Chemoreceptorsdetect the concentration of: a. specific molecules (e.g. glucose, O2, pheromones) b. groups of related molecules (e.g. "sweet" taste) c. total solute concentration (e.g. osmoreceptors)

3. Photoreceptors 4. Electromagnetic receptors 5. Thermoreceptors 6. Pain receptors

B. Response systems Q. How can you transmit a signal that results in some action from one part of the body to another? You have two basic response systems to send commands back to peripheral organs: the peripheral nervous system and chemical signals.