Final answer:
The hypothalamus and the pituitary gland are the key organs that command glands to release hormones, forming a crucial part of the endocrine system which regulates body functions.
Step-by-step explanation:
The organs that give orders to glands to release hormones are the hypothalamus and the pituitary gland. The hypothalamus, a part of the brain, secretes hormones that control the pituitary gland. The pituitary gland, often referred to as the master gland of the endocrine system, releases hormones that regulate the activity of other endocrine glands throughout the body. For example, the pituitary gland secretes thyroid stimulating hormone, which then travels through the bloodstream to the thyroid gland, signaling it to release thyroid hormones.
Overall, the endocrine system is a network of glands that release hormones into the bloodstream to regulate various body functions and maintain homeostasis. Each gland, such as the adrenal glands, thyroid gland, and the gonads, produces specific hormones that target cells in different parts of the body to elicit coordinated responses.