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Veins The intricate network of tubes in the human body that carry blood away from the heart and lungs. ■ "I need to take a break from studying and go for a walk to stretch out my veins.", ■ "When I'm feeling stressed, I like to massage my veins to help relieve tension.", ■ "My veins are so visible that they're like road maps on my arms!"
Bloods The thick red liquid that flows through the veins of all living creatures, except for some types of plants. ■ I accidentally spilled a cup of bloods on my shirt and now it's ruined!
hemorrhoid A painful, swollen lump in the rectum caused by bleeding from dilated veins. ■ "I had to go to the doctor because I had a hemorrhoid and it was causing me so much discomfort."
intravenous Intravenous (i.v.) is a medical term that means "within the veins." It is often used to describe treatments or medications that are given directly into a patient's bloodstream through an intravenous line. ■ "I'm sorry, but I can't go on this hike without my i.v. fix of caffeine!
leaf A thin, flat piece of a plant that grows on a stem, typically with veins and often with small hairs. Leaves can also refer to the pages of a book or the pages of a newspaper. ■ I'm going for a run in the park, but I forgot my headphones. It's going to be a real leaf.
Physiology The study of the internal structure and function of living organisms, particularly humans. ■ "Did you know that the average human has over 100,000 miles worth of blood vessels? No wonder we're always running low on ink for our veins!