Assistant Laboratory Animal Technician (ALAT) Practice Exam 2026 - Free ALAT Practice Questions and Study Guide

Question: 1 / 575

Which gland produces porphyrin in rats?

Sebaceous gland

Endocrine gland

Harderian gland

The Harderian gland is responsible for the production of porphyrin in rats. This gland, located behind the eye, secretes a red pigment known as porphyrin, which is often associated with tears and can be seen as a reddish-brown substance around the eyes of stressed or sick rats. Porphyrin plays a role in various physiological processes, and its presence can be a marker of stress or illness in these animals.

The sebaceous gland primarily produces sebum, which is an oily substance that helps to lubricate the skin and fur, while the endocrine gland is involved in secreting hormones rather than pigments. The salivary gland, on the other hand, produces saliva, which is important for digestion, but it does not produce porphyrin. Thus, the correct choice emphasizes the specific function of the Harderian gland in the context of rat physiology.

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Salivary gland

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