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

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Prepare for the OCR GCSE Biology Exam with detailed quizzes, flashcards, and explanations. Enhance your understanding of biology concepts and get exam-ready today!

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Which system consists of glands that secrete hormones into the bloodstream?

Endocrine system
Nervous system
Skeletal system
Circulatory system

The correct answer is: Endocrine system

The endocrine system is the correct answer because it is specifically responsible for the production and release of hormones, which are chemical messengers that travel through the bloodstream to target organs and tissues. Hormones regulate a wide range of physiological processes, including growth, metabolism, and mood. In contrast, the nervous system uses electrical signals to transmit information throughout the body, focusing on immediate responses rather than the slower, longer-lasting effects typically associated with hormonal activity. The skeletal system is primarily involved in providing structure and support to the body, while the circulatory system is responsible for the movement of blood, nutrients, and waste products, but does not secrete hormones itself. Each of the other systems serves distinct functions that do not include the secretion of hormones.