The Essential Guide to Hormones and the Endocrine System provides a comprehensive overview of key hormones and their roles in the human body. It explains how hormones influence various bodily functions, including metabolism, mood, growth, and reproduction. This guide is ideal for students and individuals seeking to understand the complexities of the endocrine system and hormone balance. Key topics include the functions of insulin, cortisol, estrogen, and testosterone, along with their impact on health and well-being. Learn about hormone imbalances and their potential health implications.

Key Points

  • Explains the role of hormones in regulating metabolism and mood.
  • Covers key hormones such as insulin, cortisol, and estrogen.
  • Discusses the impact of hormone imbalances on health.
  • Ideal for students studying biology or health sciences.
Chinaza Okoli
2 pages
Language:English
Type:Study Guide
Endocrine System
Chinaza Okoli
2 pages
Language:English
Type:Study Guide
Endocrine System
320
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THE ESSENTIAL
GUIDE TO YOUR
HORMONES
What You Need to Know
Hormones play a critical role in our bodies,
but what exactly are hormones and why are
they important for our health? We’ll decode
the body’s most important hormones and
explain how changes in hormone levels can
affect your body and your well-being.
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Aldosterone
(al·dos·te·rone)
Adrenaline
(a·dren·al·ine)
Luteinizing
Hormone (LH)
(lu·te·in·iz·ing hor·mone)
Peptide YY (PYY)
(pep·tide)
Serotonin
(ser·o·to·nin)
Parathyroid
Hormone (PTH)
(par·a·thy·roid)
Thyroid Hormones
(thy·roid hor·mones)
Leptin
(lep·tin)
Growth Hormone
(growth hor·mone)
Human Chorionic
Gonadotropin (HCG)
(hu·man cho·ri·on·ic go·nad·o·tro·pin)
Oxytocin
(ox·y·to·cin)
Progesterone
(pro·ges·ter·one)
Cortisol
(cor·ti·sol)
Testosterone
(tes·tos·ter·one)
Insulin
(in·su·lin)
Glucagon
(glu·ca·gon)
Dehydroepiandrosterone
(DHEA)
(de·hy·dro·ep·i·an·dro·ste·rone)
Melatonin
(mel·a·to·nin)
Estrogen
(es·tro·gen)
Glucagon-Like
Peptide 1 (GLP-1)
(glu·ca·gon like pep·tide)
Follicle Stimulating
Hormone (FSH)
(fol·li·cle-stim·u·lat·ing hor·mone)
Ghrelin
(ghrel·in)
Prolactin
(pro·lac·tin)
Craving pickles? Made by the adrenal
glands, it regulates blood pressure by
increasing salt and water reabsorption
in the kidney.
The flight or fight hormone allows you
to battle a danger head-on or escape to
safety. Persistently high levels of adrenaline
from chronic stress, however, increases
your risk for anxiety, depression, heart
disease and weight gain, which is why
laughter really may be the best medicine.
Puberty relies on LH and knows no bounds.
It controls the production of estrogen
or testosterone from the ovaries or
testes and is often measured during an
infertility workup to evaluate ovulation in
women or testicular function in men.
The original weight loss program,
PYY is produced in the small intestine
and released into your bloodstream
after you eat to decrease appetite and
make you feel full.
If you have major mood swings, you
can thank this hormone that boosts and
stabilizes mood. Dark chocolate converts
a compound called L-tryptophan
to serotonin, explaining why eating
chocolate makes us feel happier.
Strong bones are key to a long,
happy life, and so is PTH. From the
parathyroid glands, it’s vital to our bone
health and essential for normal calcium
and phosphorus balance in the body.
Two of the primary players that
are released by your thyroid are:
triiodothyronine (T3) and thyroxine
(T4). These hormones dictate your
weight, determine your energy levels,
internal temperature, skin, hair, nail
growth, and more.
This hormone is your very own
personal trainer. It controls appetite
by signaling your brain to stop eating.
It also helps your brain regulate
how much energy your body burns
throughout the day.
As its name implies, it promotes
human growth and plays a crucial role
in increasing muscle mass and bone
development. It’s our own personal
Game of Thrones shield, protecting
our tissues from breaking down to
avoid injury.
Congratulations you’re pregnant!
HCG is the hormone that a pregnancy
test can detect about two weeks after
conception.
Cupid’s arrow is dipped in this stuff.
Dubbed the love hormone, oxytocin
levels rise when we make physical contact
with another human. It’s also the maternal
hormone because large amounts of it are
release during childbirth and helps with
milk letdown during lactation.
The reason for that week circled in red
on your calendar, progesterone is a
crucial player in your menstrual cycle.
After ovulation these levels rise to
prepare your uterus for the implantation
of the embryo. If pregnancy doesn’t
occur, the levels drop again, causing
you to get your period.
Stressed out? This hormone is released
during times of stress, increasing heart
rate, blood pressure, blood glucose,
respiration and muscle tension in response.
It also temporarily shuts down the body’s
systems that aren’t needed in the face of
crisis, such as digestion and reproduction.
Surprisingly, this male sex hormone
plays a big role for women, too. It
contributes to your sex drive, bone
density and muscle strength. But when
levels are too high, it can cause male
pattern balding (buzzkill!).
As a person with diabetes knows, insulin
couldn’t be more important. After you eat,
cells in your pancreas release insulin that
shuttles glucose from your bloodstream
into your body’s tissues to use for energy
later. People with type 1 diabetes can’t
make insulin; people with type 2 diabetes
can’t make enough or make too much
and the body does not respond correctly.
Produced by cells in your pancreas
and works to keep your blood sugar
levels stable, this hormone breaks
down stored glucose so your body
can use it for energy.
Responsible for gossipy teenage sleep-
overs, this hormone from the adrenal
gland and ovaries initiates production
of male and female sex hormones,
welcoming fun things like pubic hair,
acne and body odor.
Insomniacs may feel too familiar with
this sleep hormone, which regulates
our sleep and wake cycles.
The female sex hormone, and one
that teenage girls know all too well,
is responsible for setting off puberty.
Produced primarily in your ovaries,
estrogen regulates your menstrual
cycle, maintains pregnancy and keeps
bones strong for women and men too!
Watch out, world.
Feeling extra satisfied after lunch?
It could be GLP-1, the appetite-
regulating hormone produced in
the gut after eating.
People struggling with infertility know the
importance of FSH. In women, it helps
control the estradiol hormone synthesis,
menstrual cycling and the production
of eggs by the ovaries. In men, it helps
control the production of sperm.
Got a rumbling in your tummy? You can
thank this hunger hormone made by
the stomach. It stimulates appetite and
prepares the body for food. Researchers
believe blocking ghrelin levels may be
the key to weight loss.
Moms-to-be are faced with major
changes, including this hormone that
rises during pregnancy. Fun fact: the
pituitary gland releases prolactin after
childbirth to trigger lactation, which
enables moms to breastfeed.
TOP
HORMONES
There are many different hormones in the
human body. Here is a look at the leading
hormones, their roles and why they’re
important to know about.
HORMONES AND THE
ENDOCRINE SYSTEM
Hormones are the body’s chemical messengers and are part of the
endocrine system. Endocrine glands make hormones, which travel
through the bloodstream to tissues and organs, and control most
of our body’s major systems. The endocrine system regulates our
heart rate, metabolism – how the body gets energy from the foods
we eat – appetite, mood, sexual function, reproduction, growth
and development, sleep cycles, and more.
HORMONE KEY FACTS
• Hormones play a critical role in our body’s chemistry, carrying
messages between cells and organs.
• Hormones affect our body’s functions, from growth and sexual
development and mood to how well we sleep, how we manage
stress and how our body breaks down food.
• When they are in proper balance, hormones help the body thrive.
But sometimes hormone levels are too high or too low. Hormone
imbalances can occur any time regardless of one’s age and cause
serious health problems requiring ongoing medical management.
ENDOCRINE GLANDS AND HORMONES
Endocrine glands are special groups of cells that make hormones.
The major endocrine glands are:
Vital to our overall health, hormone levels change as we grow and age.
Knowing more about the role they play in our bodies can help you protect and manage your health.
Visit endocrine.org for more information.
Adrenal Glands – produce androgens and cortisol; gives your body odor and pubic
hair, helps in how we respond to stress; regulates blood pressure and more.
Hypothalamus – produces hormones that regulate body temperature, appetite
and weight, mood, sex drive, sleep, and thirst.
Ovaries – female reproductive glands that produce eggs and sex hormones –
including estrogen, testosterone and progesterone – which are vital to reproductive
organ development, breast development, bone health, pregnancy, and fertility.
Pancreas – produces insulin, glucagon and other hormones but primarily
responsible for controlling blood sugar levels.
Parathyroid – controls the amount of calcium in our bones and blood.
Pineal Gland – produces melatonin, which is important for sleep cycles.
Pituitary Gland – the “master control gland” makes hormones that control growth,
reproduction, lactation, and the activity of other glands.
Testes – male reproductive glands produce sperm and secrete testosterone.
Thymus – active until puberty, produces cells crucial to the immune system that
protect the body from threats such as viruses and infections.
Thyroid – produces hormones that control the rate at which the body burns
calories and how fast the heart beats.
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FAQs

What are the main functions of hormones in the body?
Hormones serve as chemical messengers that regulate various functions in the body, including metabolism, growth, mood, and reproductive processes. They are produced by endocrine glands and travel through the bloodstream to target organs and tissues. Hormones like insulin help manage blood sugar levels, while others like cortisol are involved in the stress response. Understanding these functions is crucial for maintaining overall health.
How do hormone imbalances affect health?
Hormone imbalances can lead to a range of health issues, including weight gain, mood disorders, and reproductive problems. For example, low insulin levels can result in diabetes, while excess cortisol from chronic stress can contribute to anxiety and cardiovascular issues. Recognizing the symptoms of these imbalances is important for seeking appropriate medical intervention and managing health effectively.
What is the role of insulin in the endocrine system?
Insulin is a vital hormone produced by the pancreas that regulates blood sugar levels. It facilitates the uptake of glucose into cells, providing energy for bodily functions. Insulin also plays a role in fat storage and metabolism. Understanding insulin's function is essential for managing conditions like diabetes and maintaining overall metabolic health.
What hormones are involved in the stress response?
Cortisol and adrenaline are key hormones involved in the body's stress response. Cortisol, released by the adrenal glands, helps regulate metabolism and the immune response during stressful situations. Adrenaline, also known as epinephrine, prepares the body for 'fight or flight' by increasing heart rate and energy availability. Recognizing how these hormones function can help individuals manage stress more effectively.

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