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

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What components make up the endocrine system?

Neurons and synapses
Endocrine glands
Muscles and ligaments
Nerves and tissues

The correct answer is: Endocrine glands

The endocrine system is primarily composed of endocrine glands, which are specialized organs that produce and release hormones directly into the bloodstream. These hormones serve as chemical messengers that regulate various bodily functions, including growth, metabolism, and mood. Endocrine glands include the pituitary gland, thyroid gland, adrenal glands, pancreas, and gonads, among others. In contrast, neurons and synapses are part of the nervous system, which communicates quickly through electrical signals, while muscles and ligaments relate to the muscular and skeletal systems. Nerves and tissues encompass broader categories within the body and do not specifically address the hormonal aspect and regulatory functions of the endocrine system. Therefore, the inclusion of endocrine glands as the correct answer accurately reflects the unique role and structure of the endocrine system.