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| - The body contains three types of blood vessels, although they are all comprised of the same material. The only material difference is in regard to size and whether or not they contain one-way valves. Arteries - Which carry blood away from the heart Veins - Which carry blood to the heart Capilliaries - Which are one blood cell wide and is where the transfer of oxygen for carbon dioxide takes place.
- Blood vessels are hollow tubes that carry blood throughout the body. They consist of arteries, veins, and capillaries. Arteries carry oxygen-rich blood away from the heart. Veins carry oxygen-poor blood back to the heart. In pulmonary circulation, this is reversed. It is the pulmonary artery that brings oxygen-poor blood into the lungs and the pulmonary vein that brings oxygen-rich blood back to the heart.
- Blood vessels were part of the circulatory system and functioned to transport blood throughout humanoid bodies. Vulcan mind melds could cause pressure changes in a subject's nerves and blood vessels, something which Spock cautioned Simon Van Gelder about before beginning a meld with him in 2266. (TOS: "Dagger of the Mind" ) In 2367, Doctor Beverly Crusher noted a slight dilation of the blood vessels in Geordi La Forge's visual cortex, adding that it was nothing serious. (TNG: "The Mind's Eye" )
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| - Blood vessels are hollow tubes that carry blood throughout the body. They consist of arteries, veins, and capillaries. Arteries carry oxygen-rich blood away from the heart. Veins carry oxygen-poor blood back to the heart. In pulmonary circulation, this is reversed. It is the pulmonary artery that brings oxygen-poor blood into the lungs and the pulmonary vein that brings oxygen-rich blood back to the heart. Arteries branch into smaller vessels called arterioles. Arterioles further branch into capillaries, which deliver oxygen and nutrients to cells. Most capillaries are thinner than a hair. Many are so tiny, only one blood cell can move through them at a time. Once the capillaries deliver oxygen and nutrients and pick up carbon dioxide and other waste, they move the blood back through wider vessels called venules. Venules eventually join to form veins, which deliver the blood back to your heart to pick up oxygen.
- The body contains three types of blood vessels, although they are all comprised of the same material. The only material difference is in regard to size and whether or not they contain one-way valves. Arteries - Which carry blood away from the heart Veins - Which carry blood to the heart Capilliaries - Which are one blood cell wide and is where the transfer of oxygen for carbon dioxide takes place.
- Blood vessels were part of the circulatory system and functioned to transport blood throughout humanoid bodies. Vulcan mind melds could cause pressure changes in a subject's nerves and blood vessels, something which Spock cautioned Simon Van Gelder about before beginning a meld with him in 2266. (TOS: "Dagger of the Mind" ) In 2367, Doctor Beverly Crusher noted a slight dilation of the blood vessels in Geordi La Forge's visual cortex, adding that it was nothing serious. (TNG: "The Mind's Eye" ) Bajoran pregnancies developed blood vessels connecting the mother and child very quickly, as the gestation period was less than five months. For this reason, Dr. Julian Bashir recommended against removing Kirayoshi O'Brien's transplanted fetus from Kira Nerys's womb, as there was a risk of hemorrhage for her and respiratory trauma for the child. (DS9: "Body Parts") In 2373, a Pah-wraith possessing Keiko O'Brien threatened Miles O'Brien that by destroying even a tiny blood vessel in her brain it would destroy all of Keiko's memories and emotions if he didn't cooperate. (DS9: "The Assignment") Also that year, Bashir worried about an unconscious Garak potentially breaking a critical blood vessel in his brain as a result of psychological stimuli. (DS9: "Things Past") In 2374, The Doctor diagnosed a Romulan officer with third-degree burns, a hairline fracture of the jaw, and a ruptured blood vessel in his brain which required surgical intervention. (VOY: "Message in a Bottle")
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