Wisconsin Esthetics State Board Practice Test

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What is an organ defined as?

A group of the same type of cells
A basic unit of life
A complex structure performing specific functions
A liquid substance found within cells

The correct answer is: A complex structure performing specific functions

An organ is defined as a complex structure that performs specific functions within an organism. This definition highlights the organization and specialization of cells into more intricate forms that can carry out unique tasks essential for the body's operation. For example, the heart is an organ composed of various types of tissues including muscle, connective, and nerve tissues, all working together to pump blood throughout the body. In contrast to other options, a group of the same type of cells describes tissue rather than an organ and is a simpler structural organization. A basic unit of life refers to a single cell, which is fundamental but not complex enough to be classified as an organ. Lastly, a liquid substance found within cells points to cytoplasm or similar fluids, but this does not encapsulate the structural and functional aspects of what an organ is. Therefore, option C accurately captures the essence of an organ's role in biological systems.