Changes

The Heart releases Natriuretic Peptides which act to lower blood pressure and thus work antagonistically to the [[Renin-Angiotensin-Aldosterone System (RAAS) - Anatomy & Physiology|Renin-Angiotensin-Aldosterone System]].

 

The [[Heart - Anatomy & Physiology|Heart]] releases Natriuretic Peptides which act to lower blood pressure and thus work antagonistically to the [[Renin Angiotensin Aldosterone System|Renin-Angiotensin-Aldosterone System]].

|+ ''Natriuretic Peptides''

|+ ''Natriuretic Peptides''

!Hormone

!Hormone

!Site of Secretion within GIT

!Secreted From

!Action

!Action

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|<font color=Purple>Cholecystokinin</font>

|<font color=Purple>Atrial Natriuretic Peptide</font>

|Duodenum

|Atrial Myocytes

|Stimulates digestion of fat and protein by causing release of digestive enzymes and bile from the [[Pancreas - Anatomy & Physiology|pancreas]] and gall bladder.

|Released in response to triggers including atrial stretch, ANP increases sodium and thus water excretion at the kidneys, reducing blood volume and thus pressure. It also inhibits the Renin-Angiotensin Aldosterone System and relaxes arterioles. further reducing systemic blood pressure.

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|<font color=Purple>Gastrin</font>

|<font color=Purple>B-Type Natriuretic Peptide</font>

|G-Cells in Stomach and duodenum

|Ventricles of the Heart

|Stimulates Parietal cells in the [[Forestomach - Anatomy & Physiology|stomach]] to secrete HCl and Chief cells to secrete pepsinogen.

|Decreases vascular resistance, in the same ways as ANP but is 10x LESS potent.

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