A gland is an organ in the body that synthesizes substances such as hormones, enzymes, and sweat, and releases them for use elsewhere in the body or for elimination from the body. There are several types of glands in the human body, including exocrine glands, endocrine glands, and sweat glands.
Types of Glands
Exocrine Glands: These glands secrete their products into ducts that carry the secretions to the surface of the body or into body cavities. Examples of exocrine glands include sweat glands, salivary glands, and mammary glands.
History and Nature of Science: A student should understand the history and nature of science. A student who meets the content standard should:
Develop an understanding that historical perspectives of scientific explanations demonstrate that scientific knowledge changes over time, building on prior knowledge.
Develop an understanding that scientific knowledge is ongoing and subject to change as new evidence becomes available through experimental and/or observational confirmation(s).