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2 major blood vessels
Blood vessels can form new blood vessels, this is called angiogenesis.
Why are nephrons surrounded by many tiny blood vessels
How many kilometers of blood vessels are in your body? If they could be laid end to end, the blood vessels would cover a distance of about 60,000 miles (96,500 kilometers).
Earthworms have Red blood.
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There are three types of blood vessels. There are veins, arteries, and capillaries.
Diabetes is primarily a disease of blood vessels. Because blood vessels feed all our organs, many organs can be damaged when diabetes messes with the blood flow by damaging blood vessels. It's the constant high blood sugar in diabetics that damages blood vessels. If a diabetic keeps his blood sugar under control, it's as if he doesn't have the disease.
Marrow
Only within the blood vessels. And there are many, many of those.
Similar to humans, frogs have tiny blood vessels attached to the intestines to aid the absorption of nutrients into the blood after digestion.