1. Reflex Arcs
Nerve impulse pathways that are responsible for involuntary actions
Look like the pathway you drew and labeled:
Receptor to
Sensory neuron to
(optional step) Interneurons in the CNS (a reflex center) to
Motor neurons to
Effector

2. Reflexes
Automatic subconscious responses to changes within or outside the body:
Maintain homoestasis: blood pressure, heart rate, respirations, digestion, temperature
Automatic actions: swallowing, coughing, sneezing, vomiting

3. 2 Examples of Types of Reflexes (?)
Knee-jerk reflex (patellar tendon reflex)
Employs only 2 neurons: sensory neuron communicating directly with a motor neuron
Withdrawal reflex:
A response to painful stimuli
Sensory neuron takes impulse to interneurons in the spinal cord reflex center, where it is transmitted to motor neurons.
Other interneurons carry impulses to the brain for processing of the experience and pain.

4. Knee-jerk Reflex (Fig. 9.16)

5. Withdrawal Reflex (Fig. 9.17)