The endocrine system

Endocrine system

A system of ductless glands that secrete hormones into the bloodstream to regulate behavior and bodily processes.

Hormone

Chemical messengers that travel through the bloodstream and act on target cells with specific receptors.

Target cell

A cell that has the correct receptors and is affected by hormones.

Receptor

A protein on a target cell that interacts with specific hormones.

Ductless gland

A gland that secretes hormones directly into the bloodstream rather than through ducts.

Chemical signaling

The process by which hormones communicate with target cells.

Hypothalamus

Links the nervous system and endocrine system; controls the pituitary gland.

Pituitary gland

Known as the master gland, it regulates other endocrine glands by releasing tropic hormones.

Pineal gland

Regulates the sleep-wake cycle by secreting melatonin.

Thyroid gland

Regulates metabolism by secreting thyroxin.

Thymus

Plays a role in immune system development and produces T-cells.

Adrenal glands

Glands that release stress hormones such as epinephrine and cortisol.

Pancreas

Regulates blood sugar levels by producing insulin and glucagon.

Ovaries

Female gonads that produce estrogen and progesterone.

Testes

Male gonads that produce testosterone.

Metabolism

The chemical processes that occur within a living organism to maintain life, regulated by the thyroid.

Endorphins

Hormones released by the pituitary that act as natural painkillers.

Epinephrine

Also known as adrenaline, a hormone released during stress that prepares the body for fight-or-flight.

Norepinephrine

Also known as noradrenaline, a hormone released during stress that prepares the body for fight-or-flight.

Thyroxin (T4)

Hormone released by the thyroid that regulates metabolic rate.

Insulin

Hormone produced by the pancreas that helps cells take in glucose from the blood.

Diabetes

A condition where the pancreas produces little or no insulin or the body cannot properly use insulin.

Thymosin

Hormone secreted by the thymus that stimulates T-cell maturation.

Gonads

The sex glands (ovaries in females and testes in males) that produce sex hormones.

Testosterone

Male hormone produced by testes, responsible for male secondary sex characteristics.

Estrogen

Female hormone produced by ovaries, responsible for female secondary sex characteristics.

Progesterone

Hormone produced by ovaries that regulates the menstrual cycle and supports pregnancy.

Sympathetic nervous system

Part of the autonomic nervous system that activates the fight-or-flight response.

Runner's high

A feeling of euphoria after intense exercise, caused by the release of endorphins.

Fight-or-flight response

The body's physiological reaction to perceived harmful events, attacks, or threats.

Neurotransmitters

Chemicals that transmit signals between neurons.

Chemical messengers

Another term for hormones, as they transmit signals in the body.

Brain chemistry

The study of hormones and neurotransmitters and their effects on behavior and mood.

Master gland

A term for the pituitary gland, which regulates other endocrine glands.

Bloodstream

The flow of blood through the circulatory system where hormones are secreted.

Regulate

To control or maintain the rate or speed of a process or action.

Pituitary stalk

The connection between the hypothalamus and the pituitary gland.

Optic chiasma

An important landmark near the pituitary gland.

Tropic hormones

Hormones released by the pituitary that stimulate other endocrine glands.

Immune system development

The process by which the body develops defense mechanisms against pathogens.

Natural painkillers

Substances that relieve pain without the use of drugs, such as endorphins.

Behavioral effects

The impact of hormonal changes on an individual's actions and mood.

Secondary sex characteristics

Physical traits that develop at puberty and distinguish the sexes.

Circadian rhythms

The natural internal processes that regulate the sleep-wake cycle and other bodily functions.

Physiological processes

The functions and activities of living organisms and their parts.

Stress response

The physical and psychological reaction to perceived threats.

Homeostasis

The state of steady internal conditions maintained by living organisms.

Feedback mechanism

A process where the output of a system feeds back into the system as input.

Hormonal imbalance

A disruption of the normal levels of hormones in the body.

Psycho-endocrine pathways

The communication channels between the endocrine system and psychological factors.

Neuroendocrine system

The interaction between the nervous system and the endocrine system.

Hormonal signaling

The process by which hormones communicate with cells to induce a biological response.

Physiological reaction

The body's response to external or internal stimuli.

Gender differences

The psychological and behavioral differences between males and females, influenced by hormones.

Adrenaline rush

The surge of energy and alertness caused by the release of adrenaline.

Hypothalamic-pituitary axis

The interaction between the hypothalamus and the pituitary gland that regulates many bodily functions.

Thyroid hormones

Hormones produced by the thyroid, primarily thyroxin, which regulate metabolism.

Hormonal triggers

Signals that initiate the secretion of hormones.

Insulin resistance

A condition where cells do not respond effectively to insulin.

Metabolic disorders

Health conditions that affect the body's metabolism.

Anxiety disorders

Mental health disorders characterized by excessive fear or worry, potentially influenced by hormonal levels.

Affect

To influence or make a change in something.

Cortisol

A steroid hormone released in response to stress that regulates metabolism and immune response.

Lymphocytes

A type of white blood cell that plays a crucial role in the immune response.

T-cell maturation

The process by which T-cells develop and become functional immune cells.

B-cell

A type of lymphocyte involved in producing antibodies.

Behavioral motivation

A driving force behind actions based on hormonal influences.

Mood regulation

The influence of hormones on emotional states and feelings.

Aggression

A range of behaviors that can result in harm to oneself or others, influenced by testosterone.

Fear response

The emotional reaction exhibited in response to perceived threats, influenced by adrenal hormones.

Endocrine disruption

The interference with hormone systems in the body that can lead to adverse health effects.

Chronic stress

Long-term stress that can lead to significant physiological and psychological effects.

Hormonal therapy

The use of hormones in medical treatments to balance or alter hormone levels.

Reproductive health

The overall health of the reproductive systems in both males and females.

Body image

The perception and attitude of a person toward their physical appearance, influenced by hormonal changes.

Fertility

The natural capability to produce offspring, influenced by sex hormones.

Emotional well-being

A positive state of mental health influenced by various factors including hormones.

Cognitive function

Mental processes such as perception, memory, and reasoning, influenced by hormonal activity.

Lactation

The production and secretion of milk in mammals, regulated by hormones.

Secondary sexual characteristics

Physical traits that distinguish the two sexes and develop at puberty, influenced by sex hormones.

Hormonal fluctuations

Changes in hormonal levels that can affect emotional and physical states.

Cholesterol levels

Levels of cholesterol in the blood that can be influenced by hormones.

Sleep patterns

The regular rhythms of sleep and wakefulness, influenced by the hormone melatonin.

Symptom management

Strategies for alleviating symptoms of various health conditions through hormonal balance.

Prenatal development

The process of development of the embryo and fetus during gestation, influenced by hormones.

Childhood development

The changes that occur as children grow, significantly shaped by hormonal influences.

Adult health

Maintenance of health throughout adulthood, affected by hormonal balance.

Hormonal signaling pathways

Biological processes initiated by hormone interactions with target cells.

Hormone receptor sensitivity

The responsiveness of target cells to circulating hormones.

Biological rhythms

Natural cycles of change in our body's chemicals or functions.

Metabolic rate

The speed at which metabolism occurs in the body, directly influenced by hormones.

Biological functions

Basic processes essential to life, affected by hormone levels.

Cellular processes

The various biochemical activities that occur within cells, often regulated by hormones.

Hormonal compounds

Substances that act on the body to produce effects as hormones.

Serum levels

Concentration of hormones in the blood that can indicate health status.

Diagnostic endocrinology

The study of hormone levels and their impact on health diagnoses.

Physiology

The study of the functions and mechanisms in a living system, including hormonal regulation.

Influence of lifestyle

The effect of individual habits on hormonal balance and health.

Synthetic hormones

Laboratory-made hormones used in treatments or therapies.

Clinical endocrinology

The branch of medicine dealing with disorders of the endocrine system.