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Estrogen is involved in the development and regulation of the female reproductive system and secondary sex characteristics.

Growth hormone stimulates growth, cell reproduction, and cell regeneration in humans and other animals.

Glucagon is a peptide hormone that raises blood glucose levels by promoting the conversion of stored glycogen in the liver into glucose.

The thymus gland is involved in the development of the immune system and the production of T cells, which are essential for immune response.

Leptin is a hormone that regulates energy balance by inhibiting hunger, which in turn diminishes fat storage in adipocytes.

Oxytocin is a hormone that causes contractions of the uterus during labor and helps stimulate lactation.

Progesterone is involved in the menstrual cycle, pregnancy, and embryogenesis of humans and other species.

Aldosterone is a hormone that increases the reabsorption of sodium and water and the release of potassium in the kidneys. This increases blood volume and, therefore, increases blood pressure.

Cortisol is a steroid hormone that manages how the body uses carbohydrates, fats, and proteins, and reduces inflammation.

The pituitary gland secretes hormones that influence growth, blood pressure, and reproduction among other functions.

Adrenal glands produce hormones that are vital for survival such as cortisol, which helps regulate metabolism and helps your body respond to stress.

The hypothalamus is responsible for the regulation of certain metabolic processes and other activities of the autonomic nervous system. It synthesizes and secretes neurohormones, often called releasing hormones, that control the secretion of pituitary hormones.

Melatonin regulates the sleep-wake cycle and is involved in seasonal breeding and regulating the body's circadian rhythms.

The pancreas has dual roles; it is an organ of the digestive system and the endocrine system. It produces digestive enzymes and endocrine hormones like insulin and glucagon that regulate blood sugar levels.

The testes produce sperm for reproduction and secrete hormones, particularly testosterone, which is crucial in the development of male reproductive tissues and secondary sexual characteristics.

The placenta acts as an endocrine organ by producing hormones essential for pregnancy maintenance and fetal development, including human chorionic gonadotropin (hCG), estrogen, and progesterone.

Norepinephrine acts as a neurotransmitter and hormone. It increases heart rate, triggers the release of glucose from energy stores, and increases blood flow to skeletal muscle.

Parathyroid hormone regulates calcium levels in the blood, largely by increasing the levels when they are too low.

The ovaries produce eggs for reproduction and secrete female sex hormones, such as estrogen and progesterone.

Salivary glands produce saliva, which begins the digestion of starches, lubricates the oral cavity, and aids in swallowing.

Adrenaline is a hormone and medication which is involved in regulating visceral functions (e.g., respiration). It is also responsible for the fight-or-flight response to stress.

Parathyroid glands regulate the body's calcium and phosphate levels, which are critical for nerve function, muscle contraction, and blood coagulation.

Thyroxine, also known as T4, is a hormone produced by the thyroid gland that increases the rate of cellular metabolism throughout the body.

The thyroid gland produces hormones that regulate the body's metabolic rate as well as heart and digestive function.

Testosterone is responsible for the development of male secondary sexual characteristics and is important for maintaining muscle bulk, adequate levels of red blood cells, bone growth, and sexual function.

Enteric glands secrete enzymes and fluids that assist in the digestion and absorption of nutrients within the intestines.

Insulin is a hormone that regulates blood glucose levels by facilitating the uptake of glucose into tissues.

The pineal gland produces melatonin, which modulates sleep patterns in both seasonal and circadian rhythms.

Mammary glands produce milk to provide nutrition to young mammals after birth.