How do nerve signals and hormones travel through the body?

• A. Through muscle fibers
• B. Through our blood
• C. Via nerve cells
• D. Along the spinal cord

Answer: (B)

Hormones are chemical messengers that are released into the bloodstream by endocrine glands, such as the pituitary or adrenal glands. Once in the blood, they can travel long distances throughout the body, reaching various target organs and tissues to elicit specific responses. This mechanism is essential for regulating various physiological processes, including metabolism, growth, and mood.

While nerve signals do travel through nerve cells, hormones specifically utilize the circulatory system for distribution, making the ability of hormones to move through the blood a defining characteristic of their function. Understanding this distinction is crucial, as it highlights the difference between the rapid signaling of the nervous system and the longer-lasting effects of hormones in the endocrine system.