Chapter 7 Flashcards

1
Q

alveoli

A

saclike structures that facilitate gas exchange in the respiratory zone.

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2
Q

Boyles Gas Law

A

gas law states that at a given constant temperature, pressure and volume are inversely proportional to each other.

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3
Q

Expiration

A

(usually) passive process of breathing out air.

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4
Q

External Respiration

A

physiological process of gas exchange between lungs and pulmonary capillary blood.

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5
Q

Internal Respiration

A

physiological process of gas exchange between the blood and body tissues.

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6
Q

Pulmonary ventilation

A

breathing, is the process by which a person moves air into and out of the lungs.

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7
Q

respiratory pump

A

assists with venous return when a person changes intra-abdominal and intrathoracic pressures by breathing in and out

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8
Q

Residual volume

A

volume of air left in the lungs after a person has exhaled as much as possible.

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9
Q

Total lung capacity

A

= vital capacity + residual volume

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10
Q

vital capacity

A

The maximal amount of air that a person can exhale after a maximal inhalation

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11
Q

spirometry

A

Lung volumes, capacities, and flow rates are measured using a technique

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12
Q

tidal volume

A

volume of air entering and leaving the lungs during quiet breathing

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13
Q

respiratory membrane

A

structure in the lungs that is composed of the alveolar wall, the capillary wall, and their respective basement membranes

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14
Q

Dalton’s law

A

total pressure of a mixture of gases (like atmospheric air) equals the sum of the partial pressures of the individual gases in the mixture.

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15
Q

Fick’s law

A

states that the rate of gas diffusion through a tissue (like the respiratory membrane) is proportional to the surface area and the gas partial pressure gradient.

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16
Q

Henry’s Law

A

states that gases dissolve in liquids in proportion to their respective partial pressures

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17
Q

oxygen diffusion capacity

A
  • rate at which oxygen can diffuse from the alveoli into the blood.
  • expressed as the volume of oxygen that diffuses through a membrane per minute per 1 mmHg of pressure difference.
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18
Q

pulmonary diffusion

A

When gases move across the respiratory membrane and are exchanged between the alveoli and the pulmonary capillary blood

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19
Q

hemoglobin

A

majority of oxygen transported in the blood is bound to

20
Q

Bohr Effect

A

When the oxyhemoglobin dissociation curve shifts to the right from changes in pH or temperature

21
Q

carbaminohemoglobin

A

When carbon dioxide is bound to hemoglobin

22
Q

Oxyhemoglobin dissociation curve

A

graphical representation of the relationship between the partial pressure of oxygen and the degree of hemoglobin saturation.

23
Q

bicarbonate ion

A

majority of carbon dioxide in the blood is transported as

24
Q

arterial-mixed venous oxygen difference

A

-difference in oxygen content between arterial and mixed venous blood.
- index of oxygen extraction by body tissues.

25
Q

myoglobin

A
  • Within muscle cells, what oxygen is transported by.
    -higher affinity for oxygen than hemoglobin has
26
Q

Compared to the oxyhemoglobin dissociation curve, the oxygen-myoglobin dissociation curve is shifted to the?

A

left

27
Q

respiratory centers

A

found in the medulla oblongata and pons regions of the brain stem, help establish the rate and depth of breathing.

28
Q

Central chemoreceptors

A

trigger an increase in breathing rate and depth when stimulated by high CO2 concentrations in cerebrospinal fluid.

29
Q

Mechanoreceptors

A

in the pleurae, bronchiole, and alveoli respond to excess stretch by signaling for a decrease in inspiratory rate.

30
Q

The majority of carbon dioxide in the blood is transported as

A

bicarbonate ions

31
Q

According to ________ law, the total pressure of a mixture of gases (like atmospheric air) equals the sum of the partial pressures of the individual gases in the mixture

A

Daltons

32
Q

Hering-Breuer reflex

A

When pulmonary stretch receptors send a signal that triggers a shortened duration of inspiration, it is known as the

33
Q

When you inhale, which of the following occurs as a result of the respiratory pump?

A

Thoracic vena cavae fill

34
Q

visceral pleura

A

anchoring membrane that attaches to the lungs themselves

35
Q

Physiological “dead space” is composed of all of the following EXCEPT

A

bronchioles

36
Q

During heavy exercise, inhalation is assisted by all of the following EXCEPT

A

internal intercostals

37
Q

residual volume

A

volume of air that remains in the lungs after expiration and cannot be exhaled

38
Q

The pressure gradient that is found in the pulmonary circulation (i.e., from pulmonary arteries to pulmonary veins or left atrium) is approximately

A

10 mmHg

39
Q

PCO2 in the alveoli is approximately

A

40 mmHg

40
Q

During exercise, the oxygen diffusion capacity increases dramatically because

A

lower venous O2 content increases the PO2 gradient

41
Q

The maximum total O2-carrying capacity for a person with a blood volume of 5 L would be approximately

A

1 L O2

42
Q

If PO2 is high, a large change in PO2 would lead to _____________ in hemoglobin saturation.

A

small change

43
Q

In hemoglobin, CO2 binds to

A

globular protein

44
Q

As bicarbonate diffuses from the red blood cell into the plasma, __________ moves from the plasma into the red blood cell to prevent electrical imbalance.

A

chloride

45
Q

Compared to the slope of the oxyhemoglobin dissociation curve, the slope of the O2-myoglobin dissociation curve i

A

steeper but in the same direction

46
Q

When venous blood from exercising and nonexercising tissues is included in the calculation, it is

A

arterial-mixed venous O2 difference