Question

which endocrine gland is indicated by the arrow?
hypothalamus
pituitary gland
thyroid gland
adrenal gland
done

Explanation:

The hypothalamus is located in the brain. The pituitary gland is also in the brain, often called the "master gland" but is not shaped like a bow - tie as in the image. The adrenal glands are located on top of the kidneys. The thyroid gland is located in the neck and has a characteristic butterfly or bow - tie shape, which matches the red structure indicated by the arrow.

Answer:

thyroid gland