Hormones of Heart, Kidney, and Gastrointestinal Tract
Brief overview of hormones produced by other organs like the heart (ANF), kidney (erythropoietin), and GI tract (gastrin, secretin, CCK, GIP).
What is Hormones of Heart, Kidney, and Gastrointestinal Tract?
A hormone secreted by the atria of the heart in response to increased blood volume and pressure, which promotes the excretion of sodium and water, leading to a decrease in blood pressure.
Key points
- Identify the organs that produce ANF, EPO, Gastrin, Secretin, CCK, and GIP.
- Describe the stimuli for the release of these hormones.
- Explain the physiological effects and target organs of each hormone.
- Understand the role of these hormones in maintaining homeostasis.
Common exam trap
Confusing the target organ/tissue of these hormones.
Definitions
- Term
Atrial Natriuretic Factor (ANF)
- Meaning
A hormone secreted by the atria of the heart in response to increased blood volume and pressure, which promotes the excretion of sodium and water, leading to a decrease in blood pressure.
- Term
Erythropoietin (EPO)
- Meaning
A hormone produced primarily by the kidneys that stimulates the production of red blood cells (erythropoiesis) in the bone marrow.
- Term
Gastrin
- Meaning
A hormone produced by the stomach lining (G cells) that stimulates the secretion of gastric acid (HCl) and pepsinogen.
- Term
Secretin
- Meaning
A hormone produced by the duodenum (S cells) that stimulates the pancreas to secrete bicarbonate-rich fluid and inhibits gastric acid secretion.
- Term
Cholecystokinin (CCK)
- Meaning
A hormone produced by the duodenum and jejunum (I cells) that stimulates the contraction of the gallbladder to release bile and the pancreas to release digestive enzymes, and also promotes satiety.
- Term
Gastric Inhibitory Peptide (GIP)
- Meaning
A hormone produced by the duodenum and jejunum (K cells) that inhibits gastric acid secretion and stimulates the release of insulin from the pancreas.
Learning objectives
Identify the organs that produce ANF, EPO, Gastrin, Secretin, CCK, and GIP.
Describe the stimuli for the release of these hormones.
Explain the physiological effects and target organs of each hormone.
Understand the role of these hormones in maintaining homeostasis.
Prerequisites
Basic understanding of the circulatory system (heart, blood pressure, blood volume).
Knowledge of the renal system (kidneys, filtration, blood composition).
Fundamentals of the digestive system (stomach, intestines, digestion process).
Introduction to endocrine glands and hormones.
Common mistakes
Confusing the target organ/tissue of these hormones.
Misremembering the specific cells or locations of hormone production.
Incorrectly associating the function of one hormone with another.
Forgetting the antagonistic or synergistic roles with other regulatory systems.
Keywords
ANF
Erythropoietin
Gastrin
Secretin
CCK
GIP
Heart hormones
Kidney hormones
Gastrointestinal hormones
Blood pressure regulation
Erythropoiesis
Digestion
Homeostasis
Practice preview
Which of the following hormones is secreted by the G-cells of the stomach and stimulates the secretion of hydrochloric acid?…
easy
Which hormone is secreted by the heart and helps in lowering blood pressure?…
easy
The hormone erythropoietin, primarily produced by the kidneys, stimulates:…
easy