Effector: In a closed system, the element that initiates an action in response to a signal from a sensor. In human systems, a muscle or gland often serves as an effector.

 

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Effector: In a closed system, the element that initiates an action in response to a signal from a sensor. In human systems, a muscle or gland often serves as an effector.

Sensor: In a closed system, the element that detects change and signals the effector to initiate a response.

Reflex Arc: Pathway of neurons, effector(s) and sensory receptors that participate in a reflex.

Neurotransmitters: Chemicals released from the tip of an axon into the synaptic cleft when a nerve impulse arrives; may stimulate or inhibit the next neuron. The chemical that crosses the synaptic cleft and ca . . . View Full Definition

Motor Neurons: Neurons that receive signals from interneurons and transfer the signals to effector cells that produce a response. Nerve cells connected to a muscle or gland. Sometimes also known as effecto . . . View Full Definition