lect26-Reg of Respiration Flashcards Preview

physiology (Woods) > lect26-Reg of Respiration > Flashcards

Flashcards in lect26-Reg of Respiration Deck (23):
1

what does the dorsal respiratory group do

sets basic rhythm of respiration
prinicipal initiator of phrenic nerve activity
receive many fibers from VRG
receives lots of sensory info via the nucleus tracts solitaries
mainly associated with inspiration: ESTABLISHES RAMP SIGNAL

2

what is the NTS

sensory termination of both the vagal and glossopharyngeal nerves in the DRG and receives info from peripheral chemoreceptors, baroreceptors, and several receptors in the lungs

3

what is the primary function of the PRG

control the switch off point of the inspiratory ramp

4

what do lesions of the PRG result in

loss of the ability to turn off the inspiration without additional input from vagus nerves

5

what does the PRG mainly do

controls rate and depth of breathing
transmits signals to the inspiratory center

6

what happens when there is a loss of function in the apneustic center

causes prolonged inspiratory gasping

7

what is the normal function of the apneustic center

limit lung expansion

8

define apneusis

failure to turn off inspiration

9

what is the botzinger complex associated with

coordinating VRG output

10

what is the intermediate part of VRG associated with

dilation of the upper airway during inspiration

11

describe pre-botzinger complex

site which generates the timing (frequency) of the respiratory rhythm (central pattern generator
decides length of inspiration and expiration and also determines frequency

12

define hering-breuer inflation reflex

protective mechanism to prevent excess inflation of the lungs

13

what do chemoreceptors do when hypoxia or hypercapnia occur

rate of activity increases

14

what are central chemoreceptors sensitive to

indirectly to CO2 levels (H+) based on pH

15

what are peripheral chemoreceptors sensitive to

oxygen

16

what are examples of peripheral chemoreceptors

receptors in aortic arch
carotid body receptors

17

describe type 1 (glomus) cells of carotid bodies

chemosensors
effected by PO2 (K+ channels open when high and close when low)

18

describe type 2 (sustentacullar cells)

play a support role similar to glial cells

19

what PO2 are chemoreceptors exposed to

PO2 of arterial blood not venous

20

how do signals from slow-adapting pulm stretch receptors travel and what do they do

in vagus nerve to medulla
terminate inspiration and prolong expiration

21

what do rapidly-adapting pulm stretch receptors sign

signals travel in vagus nerve to brain and elicit cough (override normal respiratory control mechanisms)

22

what do J receptors do

sensitive to pulmonary edema
signals travel from these receptors to brain via vagus nerve and stimulate cough and tachypnea (override normal respiratory control mechanisms)

23

define hyperpnea

increasingly deeper and rapid breathing