Synergistic–epinephrine & norepinephrine.

Antagonistic hormones are a pair of hormones that have the opposite effects. For example, insulin and glucagon are antagonistic hormones because insulin functions to decrease blood glucose levels, whereas glucagon functions to increase blood glucose levels.

What Does the Hypothalamus Do?

• The portion of the brain that maintains the body’s internal balance (homeostasis).
• The hypothalamus is the link between the endocrine and nervous systems.
• The hypothalamus produces releasing and inhibiting hormones, which stop and start the production of other hormones throughout the body.

Neurotransmitters: Neurotransmitters only stimulate the postsynaptic neurons. Hormones: Oxytocin, cortisol, testosterone, and estrogen in animals and abscisic acid, cytokines, and gibberellins in plants are the examples of hormones.

There are three basic types of hormones: lipid-derived, amino acid-derived, and peptide.

The two main female sex hormones are estrogen and progesterone. Although testosterone is considered a male hormone, females also produce and need a small amount of this, too.

Hormones are molecules that carry instructions from more than a dozen endocrine glands and tissues to cells all over the body. Humans have about 50 different known hormones, which vary in their structure, action and response.

6 Important Hormones and Their Roles in Your Body

• T3 and T4. T3 and T4 are the two main thyroid hormones.
• Melatonin. Several hormones help to control your sleep/wake cycles or your circadian rhythm.
• Progesterone and testosterone.
• Cortisol.
• Insulin.
• Estrogen.

Ultimately, hormones control the function of entire organs, affecting such diverse processes as growth and development, reproduction, and sexual characteristics. Hormones also influence the way the body uses and stores energy and control the volume of fluid and the levels of salts and sugar (glucose) in the blood.