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Question Video: Recalling How Hormones Reach Their Target Organs Science

Endocrine glands are often located away from their target cells or organs in the body. Which system do most hormones use to reach their target cells or organs?

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Video Transcript

Endocrine glands are often located away from their target cells or organs in the body. Which system do most hormones use to reach their target cells or organs? (A) The nervous system, (B) the lymphatic system, (C) the blood circulatory system, (D) the digestive system.

To answer this question, we will need to review what the endocrine system is and recall how it communicates with the target cells and organs in the human body.

The endocrine system is a communication system that consists of a series of glands located throughout the human body. The main endocrine glands of the human body are the pineal gland, the hypothalamus, the pituitary gland, the thyroid gland, the thymus gland, the pancreas, the adrenal glands, and the ovaries in females and the testes in males. These endocrine glands use hormones to communicate and coordinate responses to different stimuli.

Endocrine glands secrete hormones, which are chemical messengers that travel via the bloodstream to their target cells or organs. The secreting cells in endocrine glands produce the hormones which then move directly into the blood vessels. Once in the bloodstream, hormones are able to move throughout the body using the circulatory system until they reach their target cells or organs. Since hormones need to travel to their target organs via the circulatory system, this type of communication can be slow. However, while the response of hormones is slow, the effects of hormones are long-lasting. So hormones are able to act on their target organs anywhere in the body since they’re secreted into the bloodstream. But this type of response is slow.

With this information, we are able to answer the question. Most hormones use the blood circulatory system to reach their target cells or organs.

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