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Physiology > Physiology Review Slides Lec. 24 > Flashcards

Physiology Review Slides Lec. 24 Flashcards

1
Q

J Receptors are sensitive to what?

A

Pulmonary EDEMA

  • Due to Congestive heart failure
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2
Q

Effects of decreased neuronal activity

A

Results in a Decrease in GAS EXCHANGE

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3
Q

What results when the Ramp signal ceases EARLY?

A

Shorter the duration

INSPIRATION

And

Expiration

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4
Q

Where are Type I Carotid Body cells located?

A

Near FENESTRATED Cappilaries

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5
Q

Type I Carotid Body cells

A
  • Glomus cells

- Chemosensors

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6
Q

How many carotid body cell types are there?

A

2 Total

  1. Type 1
    Glomus cells
  2. Type 2
    Sustentacular Cells
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7
Q

Hypercapnia

A

Increase in CARBON DIOXIDE levels

  • decreased activity in most neurons
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8
Q

Stimulation in J receptors results in what?

A
  • Cough

- Tachypnea (fast breathing)

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9
Q

What Establishes the Ramp signal in the Body?

A

DORSAL Respiratory group

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10
Q

What is mainly associated with INSPIRATION?

A

Dorsal Respiratory group

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11
Q

Dorsal Respiratory group

A
  • Principal Initiators do the PHRENIC Nerve group
  • Receive many fibers from the VENTRAL respiratory group
  • Mainly Associated with Inspiration
  • Establishes the RAMP Signal
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12
Q

Type II Carotid Body cells

A

Play a SUPPORT role to GLIAL cells

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13
Q

Where is the Dorsal Respiratory group located?

A

Locates in the Dorsal portion of the MEDULLA

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14
Q

Hypoxia

A

Decrease in OXYGEN Levels

  • results in decreased activity in most neurons
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15
Q

Type I Carotid Body cells on LOW PO2 levels

A
  • Closes channels and result in DEPOLARIZATION
  • Opens Up CALCIUM channels
  • NT Release
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16
Q

Type I Carotid Body cells on High PO2 LEVELS

A
  • PO2 Dep K+ channels result in EFFLUX of K+

- Leads to HYPER-POLARIZATION

17
Q

J receptors travel to the brain via what nerve?

A

Vagus

18
Q

A STRONG PRG Signal results in how many breaths per minute?

A

30-40

19
Q

Chemoreceptors in the Presence of Hypoxia or Hypercapnia

A

INCREASE their activity rate

20
Q

A WEAK PRG Signal results in how many breaths per minute?

A

3-5

21
Q

Primary fxn of the PRG

A

Pneumotaxic Center of the brain

  • Controls the “OFF-Switch” point of the INSPIRATORY ramp
22
Q

Ramp Signal during Heavy Respiration

A
  • Signals Increase RAPIDLY
23
Q

J Receptor

A
  • Sensory endings (C fibers)
  • In the alveolar wall
  • Juxtaposition to Pulmonary Capillaries
24
Q

Ramp Signal

A

Nervous signals transmitted to the INSPIRATORY Muscles

  • Mostly to the DIAPHRAGM
25
Q

What results in decreased activity in most neurons

A
  • Hypercapnia

- Hypoxia

26
Q

T/F: J receptor reflexes override the Normal Respiratory control mechanisms

A

True

Physiology (15 decks)

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