Ray is part of a line that starts at one point and extends forever in one direction.
Explanation:
In geometry, a ray can be defined as a part of a line that has a fixed starting point but no end-point. It can extend infinitely in one direction. On its way to infinity, a ray may pass through more than one point. The vertex of the angles is the starting point of the rays.
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B. A part of a line with two endpoints?
line segment
A line segment has two endpoints. It contains these endpoints and all the points of the line between them. You can measure the length of a segment, but not of a line. A segment is named by its two endpoints, for example, ¯AB.
The hypothalamus controls the anterior pituitary by means of corticotropin-releasing hormone (CRH). The hormone CRH is encoded by the CRH gene on eighth human chromosome. The anterior pituitary in turn regulates other endocrine glands by means of Adrenocorticotrophic Hormone (ACTH). These actions form part of the Hypothalamic–pituitary–adrenal(HPA) axis which is one of the important neuroendocrine systems in humans.
