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Reflex Action Flashcards

(5 cards)

1
Q

What is the reflex arc?

What are the five basic components of all reflex arcs:

A

A reflex is a rapid, involuntary motor response to a stimulus.

The reflex arc has five elements:

  • Receptor ► Sensory Neuron ► CNS Integration Center ► Motor neuron ► Effector
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2
Q

What is a monosynaptic reflex?

Give an example:

A

2 Neuron Chain involved:

In simple reflex arcs, the integration center may be a single synapse between a sensory neuron and a motor neuron.

PATELLAR REFLEX (STRETCH REFLEX)

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3
Q

What is a polysynaptic reflex?

Give an example

A

Requires 3 or more sets of neurons

More complex reflex arcs involve multiple synapses with chains of interneurons.

WITHDRAWAL REFLEX (CROSSED-EXTENSOR REFLEXES)

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4
Q

Knee Jerk Reflex (stretch reflex)

A
  • helps keep your knees from buckling when you are standing upright.
  • important for maintaining muscle tone & adjusting it reflexively
  • Monosynaptic & Ipsilateral
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5
Q

Flexor or Withdrawal Reflex

A
  • initiated by a painful stimulus and causes automatic withdrawal of the threathened body part from the stimulus.
  • protective reflexes important for survival
  • Ipsilateral and Polysynaptic
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