Oxytocin is a hormone found in both males and females, but serves a more widely recognized role in females. It is released from the posterior pituitary gland, along with antidiuretic hormone (vasopressin) hormone. Oxytocin is responsible for stimulating contractions during childbirth and is one of only a few hormones to be controlled via positive feedback.

The pituitary gland is under the control of the hypothalamus. The hypothalamus determines which and how much of each hormone the pituitary will release by secreting releasing and/or inhibiting factors. The pituitary gland is connected to the base of the hypothalamus by the pituitary stalk. 

Antidiuretic hormone (ADH) is a hormone that is produced in the hypothalamus and travels down nerve ending from the hypothalamus to be released from the posterior pituitary (neurohypophysis). ADH is the hormone that is responsible for reabsorbing water back into the blood stream at the level of the kidney.

The anterior pituitary produces seven products : follicle-stimulating hormone (FSH), luteinizing hormone (LH), adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), prolactin, endorphins, and growth hormone (GH). The posterior pituitary produces oxytocin and anti diuretic hormone (ADH). To remember the anterior pituitary products, think of the mnemonic FLAT PEG:

FSH

LH

ACTH

TSH

Prolactin

Endorphins

GH

The ovaries secrete estrogen, progesterone, and testosterone. 

In accordance with negative feedback and homeostasis, low blood calcium levels will cause the body to release a hormone in order to raise calcium levels. Parathyroid hormone is a hormone that acts to raise blood calcium levels by stimulating osteoclast activity, releasing stored calcium from bone into the blood. The parathyroid gland would be most active during low blood calcium in order to initiate this effect.

The thyroid gland is involved in raising blood calcium levels (calcitonin) and mediating metabolism (T3 and T4). The pancreas moderates blood glucose levels (insulin and glucagon). The pituitary gland is associated with several processes, including stimulation of other endocrine glands, but is not linked to parathyroid activity. The thymus is located superior to the heart and is the location of maturation for T-lymphocytes; it also secretes certain hormones that affect immune system maintenance and development.

When blood calcium levels are low, parathyroid hormone is released to increase calcium reabsorption of the kidneys and to stimulate osteoclasts, which are responsible for bone resorption. These processes serve to increase blood calcium levels.

Parathyroid hormone is an antagonist to calcitonin, which is released from the thryoid gland and increases blood calcium levels.

Calcitonin is produced by the C-cells located in the thyroid gland and its main function is to decrease plasma calcium. This is done primarily through the activation of osteoblasts, which take calcium in the blood and store it in bone.

Epinephrine is a tyrosine derivative hormone that is synthesized in the adrenal gland. The adrenal gland has two sections: the cortex and the medulla. While the cortex secretes cortisol, aldosterone, and other glucocorticoids, the medulla secretes epinephrine and norepinephrine.

The testes are associated with testosterone production. The pituitary gland secretes several hormones that regulate numerous processes throughout the body. Adrenocorticotropic hormone (ACTH) is linked to mediation of epinephrine production, but it is the sympathetic nervous system that is responsible for stimulating epinephrine release.

The zona glomerulosa secretes mineralocorticoids (aldosterone). All other pairings are correct.

Note that the layers of the adrenal gland, organized from superficial to deep, are the capsule, the zona glomerulosa, the zona fasciculata, the zona reticularis, and the adrenal medulla.