AP BIOLOGY

Detailed explanation-1: -The motor neuron sends a signal to the organ or a cell that acts to the stimuli called the effector.

Detailed explanation-2: -The primary components of the reflex arc are the sensory neurons (or receptors) that receive stimulation and in turn connect to other nerve cells that activate muscle cells (or effectors), which perform the reflex action.

Detailed explanation-3: -The receptor is the part of the body that detects the stimulus or the change. The effector is the part of the body that carries out the response to the stimulus and the response is the reaction that we observe. The scenario in the question provides our stimulus and our response for us.

Detailed explanation-4: -Spinal Cord is the center that controls reflex action. Reflex actions are actions that are carried out quickly in response to a stimulus and thus do not involve any thinking, and thus are under the control of spinal cord.

Detailed explanation-5: -An effector organ is one that acts in response to the stimulus. In the case of the reflex arc, the effector organ is almost always a muscle fibre or a group of muscle fibres. It is innervated by a motor neuron carrying information about the response. In most cases, three neurons are involved in a reflex arc.