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# Blood Vessels **Open circulatory system:** * O₂ goes to cells at one time, CO₂ is breathed out at one time. * eg insects/flies/crabs/lobsters **Closed circulatory system:** * Blood is enclosed in vessels * eg humans/larger organisms * (Artery, Capillary, Veins) **Name 2 circuits in the heart/...

# Blood Vessels **Open circulatory system:** * O₂ goes to cells at one time, CO₂ is breathed out at one time. * eg insects/flies/crabs/lobsters **Closed circulatory system:** * Blood is enclosed in vessels * eg humans/larger organisms * (Artery, Capillary, Veins) **Name 2 circuits in the heart/circulatory system:** * Systemic circuit (blood pumped around body) * Pulmonary circuit (lungs) **Blood Vessels** | Type of Vessel | Function | |---|---| | Arteries | Away from heart | | Veins | Carry blood to the heart | | Capillaries | Gas exchange | **Artery Structure** * **Muscle + elastic fibers:** * **Lumen:** * **Inelastic protein (collagen):** Prevents over-expansion. * **Endothelium:** Cells surrounding the lumen **Vein Structure** * **Muscle + elastic fibers:** * **Lumen:** * **Endothelium:** Cells surrounding the lumen **Additional Notes:** * Inelastic protein prevents over-expansion. * Muscle + elastic fibers allow for expansion and return back to original shape. * Blood flows through the lumen. * Endothelium cells surround the lumen in blood vessels.