Chapter 23 Flashcards

1
Q

external respiration aka pulmonary gas enhange what occurs

A
  • diffusion of O2 from air in the alveoli of the lungs to blood in the pulmonary caps. and diffusion of CO2 in opposite direction.
  • converts deoxygenated blood coming from the right side into oxygenated blood that returns to the left side
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2
Q

as blood flows through caps picks ups ___ and unloads ___

this is usually called an exhancge but not in this situation because each gas diffuses ___

A

O2 and CO2

independently

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3
Q

number of capillaries near Alveoli is ___

A

large

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4
Q

blood flows slow through caps in alveoli to pick up max

A

O2

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5
Q

Internal exchange or systemic gas exchange does what

A

exchanges o2 and CO2 between systemic capillaries and tissues

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6
Q

where does internal exhange occurand external exchange occur

A

it occurs in tisses throughout the boyd, external only in lungs.

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7
Q

in a person at rest tissue cell need only ___ of available O2 in oxygenated blood

A

25%

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8
Q

Blood from heart to lungs has ___ Po2 & ___ Pco2 and alveolar air is the opposite

A

low and high

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9
Q

blood form heart to tissues has ___ Po2 and ___ low Pco2

tissues is opposite

A

high and low

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10
Q

the lower the molecular weight the greater the

A

rate

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11
Q

Oxygen is not very ___ in water

A

soluble

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12
Q

what percent of oxygen is bound to Hb in RBC, thus only ___ “free to diffusese from capillaries o cell

A
  1. 5

1. 5

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13
Q

saturation of hemoglobin is linked to

A

parital pressure of oxygen

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14
Q

the greater the partial pressure the

A

greater the saturation

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15
Q

what are the four factors affecting hemoglobins affinity for oxygen

A

acidity pH, parital pressure of CO2, temp., BPG

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16
Q

increase acidity->

A

decreased affinity

17
Q

increased co2 ->

A

decreased affinity

18
Q

as blood picks up CO2 , ___ accumulates in RBCs

A

HCO3-

19
Q

What controls the muscles involed in respiration

A

medullary rhthymicity area, pneumotaxic area, and apneustic area