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Physiology Block 1- Cardiovascular Physiology > Capillary Dynamics/ Lymphatics > Flashcards

Capillary Dynamics/ Lymphatics Flashcards

1
Q

What are the characteristics of capillaries?

A

One cell layer thick, surrounded by lipid membrane, large surface area, slow blood flow

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2
Q

What are the three types of capillaries?

A

Continuous, Fenestrated, Discontinuous

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3
Q

What is the primary method of transport into/out of capillaries?

A

Diffusion

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4
Q

What factors affect diffusion?

A

Concentration gradient, properties of solute and barrier, distance, and surface area

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5
Q

What factors affect bulk flow?

A

Hydrostatic pressures and oncotic pressure

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6
Q

What is the pushing force of capillary dynamics?

A

Hydrostatic pressure

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7
Q

What is the pulling force of capillary dynamics?

A

Oncotic force

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8
Q

What term describes fluid leaving the capillary? Entering the capillary?

A

Filtration; Reabsorbtion

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9
Q

What is the primary factor for reabsorption?

A

Oncotic pressure in capillaries

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10
Q

What is the primary factor for filtration?

A

Hydrostatic pressure in capillaries

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11
Q

Where within the capillary is capillary hydrostatic pressure the lowest?

A

Venous end

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12
Q

On what end of the capillary does more reabsorbtion take place?

A

Venous end

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13
Q

What determines the hydrostatic pressure within capillaries?

A

Arterioles

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14
Q

What is the effect of decreasing arteriole resistance on capillary hydrostatic pressure?

A

Increased hydrostatic pressure

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15
Q

What is the effect of decreasing compliance on venous hydrostatic pressure?

A

Increases hydrostatic pressure

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16
Q

What is the equation for Starling forces?

A

Q=K((Pc -Pif) - reflection coefficient (capillary oncotic pressure -interstitial fluid oncotic pressure))

17
Q

What does the capillary filtration coefficient (K) respresent?

A

Permeability of capillary barrier

18
Q

What does the reflection coeeficient (sigma) represent?

A

Impediment of protein movement across the barrier

19
Q

What might increase the interstitial fluid oncotic pressure?

A

Leak of proteins into the interstitial fluid

20
Q

An increased interstitial fluid hydrostatic pressure would have what effect on lymphatics?

A

Increased lymphatic volume

Physiology Block 1- Cardiovascular Physiology (17 decks)

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