Tissue Fluid Flashcards

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1
Q

What are capillaries the site for?

A

Capillaries are the site for exchange of substances between blood and the cells

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2
Q

How does tissue fluid allow the exchanging of substances in capillaries?

A
  • fluid that is pushed out of the capillaries
  • surrounds all cells in the body x provides the environment in which cells exist
  • supplies glucose, amino acids, fatty acids, ions and oxygen to tissues
  • allows removal of CO2 and waste materials from tissues to blood
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3
Q

how does tissue fluid form?

A
  • ultrafiltration of blood plasma (only small molecules can pass across surface of capillaries)
  • large molecules remain in blood plasma
  • pumping of heart, causes hydrostatic pressure
    artery => arteriole => capillary => venule => vein
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4
Q

describe the hydrostatic pressure in capillaries at the arteriole end

A
  • higher hydrostatic pressure in capillaries vs outside capillaries (pressure gradient for tissue fluid out)
  • lower water potential of blood vs tissue fluid
  • net movement of fluid out
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5
Q

describe the exchange of substances that occur between cells and tissue fluid

A

useful products tissue fluid => cell
waste products
cell => tissue fluid

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6
Q

describe the hydrostatic pressure in capillaries at the venule end

A
  • lower hydrostatic pressure in capillaries since tissue fluid has left at the arteriole end
  • lower water potential of blood vs tissue fluid (1. plasma proteins remaining in capillary 2. water moved out at arteriole end)
  • net movement of tissue fluid back into capillary
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7
Q

what is the lymphatic system?

A

some tissue fluid passes into lymph vessels, lymph has similar composition to tissue fluid but also carries more lipids

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