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Light hitting your retina.
Stimulus
The optic nerve sending signals to the brain.
Sensor
The brain processing visual information.
Control
Pupils constricting in bright light.
Response of the Effector
The bladder stretching as it fills with urine.
Stimulus
Stretch receptors in the bladder sending signals to the brain.
Sensor
The brain signaling the bladder to contract when it's full.
Control
Bladder muscles contracting to release urine.
Effector
Smelling smoke in the air.
Stimulus
Olfactory nerves sending signals to the brain.
Sensor
The brain recognizing the smell of smoke as dangerous.
Control
Running away from a fire.
Response of the Effector
A sudden drop in blood pressure.
Stimulus
Baroreceptors in arteries detecting the pressure change.
Sensor
The brain signaling the heart to beat faster.
Control
The heart increasing its beating rate.
Effector
Hearing your name called.
Stimulus
Auditory nerves sending signals to the brain.
Sensor
The brain identifying the sound as your name.
Control
Turning your head toward the sound.
Response of the Effector