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**Lungs** are the main organs for breathing. The main function of the **trachea** is to funnel the inhaled air to the lungs and the exhaled air back out of the body.
The **heart** is a complex muscle that pumps blood through the three divisions of the circulatory system: the coronary (vessels that serve the heart), pulmonary (heart and lungs), and systemic (systems of the body).
The **stomach** is a saclike organ that secretes gastric digestive juices. The **pancreas** is important gland that secretes digestive juices.
The **spleen** is the site where APCs that have trapped foreign particles in the blood can communicate with lymphocytes.
The **gallbladder** is a small organ that aids the liver by storing bile and concentrating bile salts.
The **kidneys** are a pair of bean-shaped structures that are located just below and posterior to the liver in the peritoneal cavity.
The **liver** produces bile, a digestive juice that is required for the breakdown of fatty components of the food in the duodenum while also processing the vitamins and fats and synthesizing many plasma proteins.
The **colon** is home to many bacteria that aid in the digestive processes.
The **small intestine** is the organ where the digestion of protein, fats, and carbohydrates is completed.
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CC licensed content, Shared previously, Concepts of Biology, Authored by: OpenStax College. License: CC BY: Attribution. License Terms: Download for free at: http://cnx.org/contents/b3c1e1d2-839c-42b0-a314-e119a8aafbdd@8.39*
