Which term refers to the condition caused by the production of too little of a hormone or substance?

The term "hyposecretion" specifically refers to the condition where the body produces an insufficient amount of a hormone or other biochemical substance. This can lead to various health issues depending on which hormone is not being produced in adequate quantities. For example, hyposecretion of insulin can result in diabetes, while inadequate production of thyroid hormones can lead to hypothyroidism.

Other choices refer to different concepts. "Hypersensitivity" denotes an exaggerated immune response to a substance, which does not relate to hormone production. "Hypersecretion" describes the condition of producing too much of a hormone, which is the opposite of hyposecretion. "Deficiency" is a broader term that can apply to a lack of nutrients or other substances in the body, but it doesn't specifically address the hormonal context that hyposecretion does. Thus, hyposecretion is the precise term used to describe the condition of too little production of a hormone or substance.