OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Which system in the body is responsible for hormone distribution?

The respiratory system
The circulatory system
The muscular system
The skeletal system

The correct answer is: The circulatory system

The circulatory system is responsible for the distribution of hormones throughout the body. Hormones are chemical messengers produced by glands in the endocrine system, and once they are released into the bloodstream, they travel through blood vessels to reach various target organs and tissues. This system ensures that the hormones can effectively communicate and regulate physiological functions such as metabolism, growth, and mood. In contrast, the respiratory system is primarily involved in the exchange of gases, specifically the uptake of oxygen and the release of carbon dioxide. The muscular system is focused on movement and stability of the body, while the skeletal system provides structure and support but does not play a role in hormone transport. The circulatory system is crucial for maintaining homeostasis and facilitating the action of hormones by ensuring they reach the necessary locations in the body promptly.