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Found in the bone marrow and liverA large organ that produces bile, detoxifies blood, and stores nutrients., these capillariesThe smallest blood vessels where gas, nutrient, and waste exchange occurs between blood and tissues. are permeable to red and white blood cellsThe basic structural and functional units of life..
Tunica Externa
Absent
Tunica Media
Absent
Tunica Interna (Intimia)
The simple squamous epithelial cells of these capillaries have the largest intercellular clefts (spaces between the cells). These clefts make these capillaries the most permeable of the three types. In sinusoidal capillaries, the intercellular clefts are extremely large. Entire cells such as erythrocytes(RBCs): Red blood cells responsible for oxygen transport. (red blood cells) and leukocytes (white blood cells) can fit in these clefts. Red blood cells and white blood cells are created in red bone marrow. This marrow is found in flat bones such as those in the sternumFlat bone forming the center of the chest; anchor for ribs and clavicles. Appears as a vertical dagg and coxal bones (hips). Sinusoidal capillaries allow these newly formed cells to leave the bone marrow and enter into circulating blood.
Lumen
Big enough for only one erythrocyte
Figure 1: Slide 48b Fetal leg, cross section A cut or slice of the body or an organ for study., Masson stain
All by University of Michigan Histology, licensed under CC BY-NC-SA 3.0.
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Link to more on Blood Vessel Histology
Elastic Arteries
Muscular Arteries
Arterioles
Sinusoidal Capillaries
Fenestrated Capillaries
Continuous Capillaries
Venules
Veins
List of terms
- liver
- capillaries
- cells
- erythrocytes
- sternum
- section