Blood vessels that carry blood away from the heart. Capillaries Tiny, thin-walled blood vessels that allow the exchange of gases and nutrients between the blood and cells and are located between arteries and veins.
Two students working on an essay together. The definition of an essay is a short piece of writing that expresses information as well as the writerâs opinion. An example of an essay is a short paper about why smoking is bad for you. To essay is defined as to try something.
The following are some of the commonly written essays at college and high school levels. 1  Argumentative essay: This essay is meant to put across a particular argument to the reader. 2  Descriptive essay: This essay is meant to describe feelings of the reader to the writer. 3  Expository essay: This is a research-based essay.