Chapter 37 - Guyton Flashcards

1
Q

Define pulmonary ventilation.

A

inflow and outflow of air between the atmosphere and the lung alveoli

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2
Q

What is primarily responsible for expiration?

A

elastic recoil of the lungs, chest wall, and abdominal structures compresses the lungs

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3
Q

Muscles that help raise the ribcage during inspiration?

A

external intercostals, SCM, serratus anterior, scaleni

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4
Q

During heavy breathing, which muscles aid expiration?

A

abdominal muscles (internal intercostals also)

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5
Q

Pleural pressure

A

the pressure of the fluid in the thin space between the lung pleura and the chest wall pleura

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6
Q

What change occurs in the pleural pressure during inspiration?

A

expansion of the chest cage pulls outward on the lungs with greater force and creates more negative pressure (-5 to -8)

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7
Q

Alveolar pressure

A

the pressure of the air inside the lung alveoli

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8
Q

What change occurs in alveolar pressure during inspiration?

A

to drive air in, the pressure must fall (0 to -1 then +1 during expiration)

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9
Q

What is transpulmonary or recoil pressure?

A

the difference in pressure between the outer surface of the lungs and the alveoli, it is a measure of the elastic forces

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10
Q

What is lung compliance?

A

the extent to which the lungs will expand for each unit increase in transpulmonary pressure (200 mL)

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11
Q

The elastic forces of the lung tissue are determined
mainly by _____ and ______ fibers interwoven
among the lung parenchyma.

A

elastin, collagen

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12
Q

What is primarily responsible for collapse of the lungs, which force?

A

fluid-air surface tension forces in the alveoli represent about two thirds (rather than tissue elastic forces)

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13
Q

Secrete surfactant in the lungs.

A

type II alveolar epithelial cells

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14
Q

Primary role of surfactant?

A

greatly reduces the surface tension of water

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15
Q

Spirometry

A

record the volume movement of air into and out

of the lungs

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16
Q

Tidal volume (TV)

A

volume of air inspired or expired with each normal breath; it amounts to about 500 milliliters in the adult male

17
Q

Inspiratory reserve volume (IRV)

A

extra volume of air that can be inspired over and above the normal tidal volume when the person inspires with full force; it is usually equal to about
3000 milliliters

18
Q

Expiratory reserve volume (ERV)

A

maximum extra volume of air that can be expired by forceful expiration after the end of a normal
tidal expiration; this normally amounts to about
1100 milliliters

19
Q

Residual volume (RV)

A

volume of air remaining in the lungs after the most forceful expiration; this volume averages about
1200 milliliters

20
Q

What is inspiratory capacity?

A

IC = TV + IRV; This is the amount of air (about 3500 milliliters) a person can breathe in, beginning at the normal expiratory level and distending the lungs to the maximum amount.

21
Q

What is the functional residual capacity?

A

FRC = ERV + RV; This is the amount of air that remains in the lungs at the end of normal expiration (about 2300 milliliters).

22
Q

What is the vital capacity (VC)?

A

VC = TV + IRV + ERV; This is the maximum amount of air a person can expel from the lungs after first filling the lungs to their maximum extent and then expiring to the maximum extent (about 4600 milliliters).

23
Q

What is the total lung capacity?

A

The total lung capacity is the maximum volume to
which the lungs can be expanded with the greatest
possible effort (about 5800 milliliters); TLC = VC + RV

24
Q

What is minute respiratory volume?

A

total amount of new air moved into the respiratory passages each minute; this is equal to the tidal volume times the respiratory rate per minute (average is 6 L/min = 500 mL tidal volume x 12 breaths per min)

25
Q

What is meant by “dead space?”

A

air that never reaches the gas exchange areas (nose, pharynx, and trachea); normal dead space volume is about 150 mL

26
Q

What is the difference between anatomical and physiological dead space?

A

anatomical - air that does not participate in gas exchange; physiological - non-functioning alveoli

27
Q

What is the equation for alveolar ventilation?

A

Va = RR x (Vt x Vd); RR = respiratory rate, Vt = tidal volume, Vd = dead space)

28
Q

Sympathetic stimulation of the lungs (NE and EPI) results in what?

A

dilation of the bronchioles

29
Q

Parasympathetic stimulation of the lungs (Ach) results in what?

A

bronchiolar constriction (vagus nerve)

30
Q

Phonation is achieved by?

A

larynx

31
Q

Articulation is achieved by?

A

structures of the mouth (lips, tongue, soft palate)

32
Q

Which cranial nerve carries the cough reflex?

A

CN X vagus

33
Q

Which cranial nerve carries the sneeze reflex?

A

CN V trigeminal