Secretions from endocrine glands are known as?

Secretions from endocrine glands are known as hormones. Hormones are chemical messengers that travel through the bloodstream to target organs or tissues, where they elicit specific biological responses. Each hormone has a particular function – for example, insulin helps regulate blood sugar levels and adrenaline prepares the body for a fight-or-flight response.

The other options refer to specific instances or types of substances related to hormones but do not accurately represent the broader category of secretions from endocrine glands. For instance, goiters are an enlargement of the thyroid gland that can occur due to over- or underproduction of thyroid hormones, but they are not a type of secretion themselves. Insulin is a specific hormone produced by the pancreas that regulates glucose levels, while adrenaline (or epinephrine) is another specific hormone produced by the adrenal glands, involved in the body's stress response. Thus, hormones serve as the correct term to encompass all secretions from endocrine glands.