3. Capillaries

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12 Terms

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capillaries

  • Main function: allow transport/exchange of materials with blood

  • Microscopic blood vessels that connect arterioles to venules

  • have the greatest surface area of any vessel type

    • approximately 2 acres of surface area within the body and about 1 RBC in diameter

    • facilitates efficient functions

  • thin walls consist of endothelium (tunica intima) only

  • have very low blood pressure

<ul><li><p><u>Main function</u>: allow transport/exchange of materials with blood</p></li><li><p>Microscopic blood vessels that connect arterioles to venules</p></li><li><p>have the greatest surface area of any vessel type</p><ul><li><p>approximately 2 acres of surface area within the body and about 1 RBC in diameter</p></li><li><p>facilitates efficient functions</p></li></ul></li><li><p>thin walls consist of endothelium (tunica intima) only</p></li><li><p>have very low blood pressure</p></li></ul><p></p>
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continuous, fenestrated, and sinusoids

what are the three types of capillaries?

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Continuous capillaries

  • most common type of capillary

  • endothelial cells form the unbroken lining

<ul><li><p>most common type of capillary</p></li><li><p>endothelial cells form the unbroken lining</p></li></ul><p></p>
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fenestrated capillaries

similar to continuous capillaries except some of the endothelial cells contain small pores or windows, which make it more permeable

(pores/windows are in the name)

<p>similar to continuous capillaries except some of the endothelial cells contain small pores or windows, which make it more permeable</p><p>(pores/windows are in the name)</p>
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sinusoids/sinusoidal capillaries

larger capillaries with large fenestrations that allow molecules or whole cells to move their walls

<p>larger capillaries with large fenestrations that allow molecules or whole cells to move their walls</p>
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capillary networks

blood enters the [blank] from an arteriole

<p>blood enters the [blank] from an arteriole</p>
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precapillary sphincters

Blood flow into and through the capillary beds is regulated by [blank]

<p>Blood flow into and through the capillary beds is regulated by [blank]</p>
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diffusion

While blood is in the capillary beds, [blank] of materials into/out of the interstitial spaces can occur

<p>While blood is in the capillary beds, [blank] of materials into/out of the interstitial spaces can occur</p>
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venule

Blood exits the capillary bed via a [blank]

<p>Blood exits the capillary bed via a [blank]</p>
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high metabolism

Tissues with [blank] have more capillary networks – lungs, liver, kidneys skeletal muscle, and cardiac muscle

<p>Tissues with [blank] have more capillary networks – lungs, liver, kidneys skeletal muscle, and cardiac muscle</p>
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thermoregulation

Capillary networks in the skin aid in [blank]

<p>Capillary networks in the skin aid in [blank]</p>
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nutrient and waste product exchange

Major function of capillaries is…

<p>Major function of capillaries is…</p>

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