Endocrine System: Glands, Hormones, and Regulation

What are the main components of the endocrine system?

Endocrine glands such as the thyroid gland and adrenal gland.

What are hormones?

Chemical messages released by endocrine glands that are carried in the bloodstream.

What is the primary function of the endocrine system?

To maintain homeostasis and regulate various bodily functions.

What are the four classifications of chemical messengers?

Autocrine, paracrine, neurotransmitters, and endocrine chemical messengers.

What is an autocrine chemical messenger?

A messenger that stimulates the cell that secreted it.

What is a paracrine chemical messenger?

A messenger that affects neighboring cells.

How do neurotransmitters function?

They are chemical messengers secreted by neurons that affect active neurons, muscles, or glandular cells.

What distinguishes endocrine chemical messengers?

They are secreted into the bloodstream.

What are the two types of hormones based on solubility?

Water-soluble (non-steroids) and lipid-soluble (steroids).

How do water-soluble hormones function?

They bind to receptors on the cell membrane and require a second messenger to activate a response.

What is the role of lipid-soluble hormones?

They diffuse easily through the cell membrane and bind to receptors inside the cell, turning genes on or off.

What is humoral stimulus in hormone release?

Release of hormones in response to changes in blood levels of ions or nutrients.

What is neural stimulus in hormone release?

Hormone release triggered by neurotransmitter activation of endocrine cells.

What is hormonal stimulus in hormone release?

Hormone secretion that stimulates another endocrine gland to release hormones.

What is the function of the hypothalamus in the endocrine system?

It acts as the control center for the autonomic nervous system and endocrine system.

What hormones are released by the anterior pituitary gland?

GH, ACTH, TSH, FSH, LH, and prolactin.

What hormones are released by the posterior pituitary gland?

ADH (antidiuretic hormone) and oxytocin.

What is the role of calcitonin?

It deposits calcium into bones from the bloodstream.

What is the function of parathyroid hormone (PTH)?

It releases calcium from bones into the bloodstream.

What are the effects of aldosterone?

It helps increase blood volume and pressure by retaining sodium and water.

What is the role of cortisol?

It assists the body in dealing with stress and increases blood sugar levels.

What is Addison's Disease?

A condition characterized by low adrenal cortex hormones, leading to weight loss and low blood pressure.

What is Cushing's Syndrome?

A condition resulting from high adrenal cortex hormones, leading to obesity and high blood pressure.

What are the functions of the pancreas in the endocrine system?

It secretes glucagon from alpha cells and insulin from beta cells to regulate blood sugar levels.

What is the difference between Type 1 and Type 2 diabetes mellitus?

Type 1 is due to the pancreas not producing insulin, while Type 2 involves insulin resistance despite normal insulin production.

What hormones do the gonads produce?

Testosterone in males and estrogen and progesterone in females.

What is the function of the thymus gland?

It is crucial for the immune system, allowing maturation of lymphocytes into T cells.

What hormone does the pineal gland produce?

Melatonin, which regulates sleep and inhibits reproductive hormones.