The mouth, throat, esophagus, stomach, intestines and rectum.

An inorganic element or compound occurring in nature that is essential to the body.

An organic compound found in plants and animals that is vital to the body and serves as a co-factor or co-enzyme to hasten or facilitate metabolic processes. Vitamins are not sources of energy and are… 

Carbohydrates, proteins, fats, vitamins and minerals used by the body for metabolism.

An exocrine gland located in the brain that regulates the activity of other glands by releasing 10 different stimulating hormones into the bloodstream. The pituitary is controlled by the hypothalamus.

The part of the brain that monitors hormone levels of all the exocrine glands and controls their activity through action on the pituitary gland to secrete whatever stimulating hormone is needed. The exocrine glands are: pituitary,… 

One of two glands each located on top of a kidney that makes adrenocortical hormones and releases them as required into the bloodstream.  The three adrenal hormones are glucocorticoids (cortisol) to control the stress response, mineralocorticoids (aldosterone) to… 

Four small endocrine glands located in the neck close to the thyroid gland that make parathyroid hormone (parathormone) and release it in response to parathyroid stimulating hormone for the purpose of regulating calcium and phosphorus metabolism.

An endocrine gland located under the breastbone in the chest that produces T-lymphocytes for the purpose of controlling immune function.

An endocrine gland located in the brain that makes hormones for the purpose of controlling the sleep-wake cycle.