First Aid Anatomy Flashcards

(22 cards)

1
Q

Type II pneumocytes

A
  1. produce surfactant
  2. act as stem cells
    are stimulated during lung damage
    Cuboidal cells
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2
Q

Clara cells

A

Non-ciliated, low columnar/cuboidal with secretory granules.

degrade toxins

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3
Q

When are alveoli prone to collapse?

A

on expiration.

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4
Q

What is the most important component of surfactant?

A

dipalmitoylphosphatidylcholine

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5
Q

when does surfactant synthesis begin? how do you know that is matured?

A

week 26, usually matured around week 35 have to check lecithin: sphingomyelin ration (over 2 is mature)

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6
Q

If the lecithin: sphingomyelin ration is below 2 what would you treat with to speed maturation of type II pneumocytes?

A

corticosteroids to mother….simulates stress during birthing and thus aids in pneumocyte maturation

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7
Q

Relation of pulmonary artery to bronchus?

A

RALS-right anterior, left superior

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8
Q

What are the structure perforating the diaphragm?

A

T8–IVC
T10–Esophagus and vagus
T12– Aorta, thoracic duct, Azygos vein

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9
Q

Diaphragm is innervated by what nerve. How is pain referred to the left shoulder?

A

Phrenic N. (C3,4,5)
C5 refers pain to the left shoulder
C3,4 refers pain to trapezius ridge

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10
Q

What is anatomic dead space?

A

Air in conducting airways that do not reach the respiratory zone

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11
Q

Physiologic dead space?

A

Anatomic dead space + functional dead space
functional dead space–air in respiratory zone that does not undergo gas exchange.
highest functional dead space in apex of the lungs (bc least perfused)

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12
Q

Alveolar ventilation?

A

Volume of gas reaching the alveoli

VA=(VT-VD) * RR

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13
Q

What is compliance of the lung?

A

Change in volume for a given change in pressure

Amount the lung can stretch when forced to

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14
Q

What factors lead to increased oxygen unloading? what type of shift is this on the curve?

A
Right shift (decreased affinity for oxygen)
high CO2, H+, 2,3 BPG, Cl-, Temp.
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15
Q

What is fetal hemoglobin comprised of and why does it have a greater affinity for oxygen than adult hemoglobin?

A

2 alpha chains, 2 gamma chains

Lower affinity for 2,3 BPG: thus higher affinity for O2.

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16
Q

Methoglobin.

What can it be used to treat

A
Iron is in ferric form (fe3+)--does not bind O2 as readily
Cyanide poisoning (higher affinity for cyanide)
17
Q

Symptoms of Methoglobinemia? Treatment?

A

Chocolate colored blood, cyanosis

Methylene Blue

18
Q

Cyanide poisoning, how does methoglobin work?

A

Nitrites are given to convert Hg to MHg

Thiosulfate is given to bind bind cyanide–Thiocynate is renally excreted

19
Q

When does cyanosis appear?

A

When deoxy hemoglobin is over 5g/dl

20
Q

CO poisoning

A

Normal Hb, decrease O2 sat, decrease total O2

21
Q

Anemia

A

decreased Hb. everything else normal. decrease total O2

22
Q

Polycythemia

A

Increased Hb, everything else normal. increase total O2