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Physiology 201 > Unit 4 Lecture 31 > Flashcards

Unit 4 Lecture 31 Flashcards

1
Q

Define reflex

A

a rapid automatic response to a stimulus

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2
Q

Define reflex arc

A

the “wiring” of a particular reflex

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3
Q

Define innate reflex

A

reflex you are born knowing

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4
Q

Define learned reflex

A

reflex acquired through experience

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5
Q

What are the components of a reflex arc?

A
  • Sensory receptor
  • Sensory neuron
  • Integrating center (w/ or w/out interneuron)
  • Motor neuron
  • Effector
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6
Q

What are the 4 classification of reflexes?

A
  1. Monosynaptic vs. polysynaptic
  2. Somatic vs. Autonomic (visceral)
  3. Cranial vs. Spinal
  4. Ipsilateral vs. Contralateral vs. bilateral
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7
Q

Define monosynaptic

A

no interneuron

  • direct connection between sensory and motor neuron
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8
Q

Define polysynaptic

A

has interneuron between sensory and motor neuron

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9
Q

Define somatic

A

voluntary

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10
Q

Define autonomic

A

involuntary

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11
Q

Define cranial reflex

A

reflex needs to go to the brain to process

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12
Q

Define spinal reflex

A

Reflex is processes at the spine

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13
Q

Define ipsilateral

A

reflex happens on same side of body as stimulus

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14
Q

Define contralateral

A

reflex happens on opposite side of body as stimulus

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15
Q

Define bilateral

A

reflex happens on both sides of body

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16
Q

What are the pathways of 4 reflex arcs?

A
  1. stretch reflex
  2. Tendon reflex
  3. Flexor reflex
  4. Crossed extensor reflex
17
Q

What is unique about all the pathways of reflex arcs?

A

All are somatic and spinal

18
Q

What is the purpose of the stretch reflex?

A

Preventing injury from over stretching muscle

19
Q

How does the stretch reflex start?

A

The stretch is sensed by a muscle spindle

20
Q

Anatomy of a muscle spindle during a stretch reflex

A

Muscle spindle made of intrafusal muscle fibers

Efferent nerve fiber connect to the end plate of the extrafusal muscle fiber

21
Q

What results in the stretch reflex?

A

contraction of muscle that was stretched

22
Q

Summary of the stretch reflex

A

Monosynaptic, ipsilateral, spinal, somatic

23
Q

What is the purpose of the tendon reflex?

A

To prevent damage from TENSION build up

24
Q

How does the tendon reflex start?

A

Tension is sensed by the Golgi tendon organ

25
Q

Anatomy of golgi tendon organ

A

Golgi tendon organ is connected to the sensory nerve fiber on a tendon

26
Q

What results in the tendon reflex?

A

Restriction of the muscle that is contracting

27
Q

Summary of the tendon reflex?

A

Polysynaptic, ipsilateral, spinal, somatic

28
Q

What is the purpose of the flexor reflex

A

To protect body from more injuries

29
Q

How does the flexor reflex start?

A

Pain (or threat of pain) is sensed by nociceptors

30
Q

Define nociceptors

A

A sensory receptor for painful stimuli

31
Q

Flexor reflex pathway

A
  1. tack stimulates sensory receptors
  2. sensory excited neuron
  3. In integrating center, sensory neuron activate OTHER SEGMENTS of spinal cord
  4. motor neuron excited
  5. effector (flexor muscle) contracts and withdraws leg
32
Q

What results in the flexor reflex?

A

flexion of affected limb

33
Q

Summary of flexor reflex

A

Polysynaptic, ipsilateral, spinal, somatic

34
Q

What is the purpose of the crossed extensor reflex?

A

To stabilize body position when a painful stimulus results in flexion of opposite limb

*usually paired w/ flexor reflex

35
Q

How does the crossed extensor reflex start?

A

Pain is sensed by nociceptors

36
Q

What results in the crossed extensor reflex?

A

Extension of the opposite limb

37
Q

Summary of the crossed extensor reflex

A

Polysynaptic, contralateral, spinal, somatic

Physiology 201 (38 decks)

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