Susanna gave a presentation on the endocrine system. When she said that the gland called TSH produces and secretes hormones such as the thyroid, her teacher marked her down a point. Why did the teacher mark Susanna down?

TSH stands for thyroid-stimulating hormone; it is a hormone, not a gland. The thyroid is a gland that secretes TSH, so Susanna reversed the relationship between the gland and the hormone. Choice C correctly identifies the thyroid as the gland and TSH as the hormone it secretes.

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