Pineal gland

figure 50-8

figure 50-8

The pineal gland, located near the base of the brain, secretes the hormone melatonin at night.

figure 50-9

As shown from this back view of the head, the four parathyroid glands are located on the posterior side of the thyroid gland. They secrete a hormone that regulates the concentration of calcium ions in the blood.

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