Final answer:
The statement that describes an endocrine function is 'Adrenal glands release adrenaline into the blood,' as endocrine glands secrete hormones directly into the bloodstream without the use of ducts.
Step-by-step explanation:
The statement that describes an endocrine function rather than an exocrine function is: a. Adrenal glands release adrenaline into the blood. In this case, adrenaline is a hormone that is released into the bloodstream by the adrenal glands, making it an example of an endocrine function.
Endocrine glands are ductless and release hormones directly into the bloodstream, which then carry these hormones to various parts of the body where they exert their effects. In contrast, exocrine glands release their substances through ducts to an external or internal surface. For example, saliva from salivary glands is secreted into the mouth, which is an exocrine function.