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3) To The Muscle!

Integration Center (CNS) sends electrical impulse through motor neuron to the effector.

The effector is a muscle fiber or gland cell

Response is contraction, secreting, etc. to remove the body from danger,

Effector

2) The Control Center

An integration center inside a vertebrae lapses the information through interneurons to the motor neuron

Monosynaptic Reflex - One synapse

Polysynaptic Reflex - Many synapses and interneurons

Sensory neuron

Integration Center

Interneurons

Motor Neuron

1) Stimulation

Receptors in skin pick up pain and send electrical impulses to the Central Nervous System through the sensory neuron.

Receptor

Sensory neuron

CNS (in spinal column)

The Homeostatic Process

Variable: Pain

Stimulus: Pain

Receptor: Pain receptor in skin

Signal (input): Electrical impulse

Afferent Pathway: Sensory neuron

Control Center: Integration Center (CNS)

-simple reflex monosynaptic reflex

-complex reflex polysynaptic reflex

Control Center output signal: Electrical impulse

Afferent Pathway: Motor neuron (CNS)

Effector: Muscle fiber or gland cell

Feedback Response: Contraction, secretion, etc.

Human Reflex Arc

Reflexes

A reflex is the body's involuntary movement to a stimulus.

Pain reflexes are usually withdrawl actions

The Body's Natural Pain Response

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