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Blood Pressure Control

11 videos
The human body enjoys stability. For example, if your blood pressure changes, the body puts a couple of brilliant systems into motion in order to respond and bring your blood pressure back to normal. There are some quick responses using nerves and some slower responses using hormones. The system using hormones is sometimes called the renin-angiotensin-aldosterone-system (RAAS), which is the main system in the body for controlling blood pressure. When your blood pressure drops too low or gets too high, your kidneys, liver, and pituitary gland (part of your brain) talk to each other to solve the problem. They do this without you even noticing! Learn how the body knows when the blood pressure has changed, and how hormones like angiotensin 2, aldosterone, and ADH help return blood pressure to back to normal.

Regulation of blood pressure with baroreceptors

VIDEO 12:09 minutes
Learn about how the arteries use nerve impulses to help regulate blood pressure. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Parts of a nephron

VIDEO 9:09 minutes
Learn about the 5 major parts of the kidney's nephron. Rishi is a pediatric infectious disease physician and works at Khan Academy.

General overview of the RAAS system: Cells and hormones

VIDEO 14:09 minutes
Learn the important cells and hormones that are working together to control your blood pressure! Rishi is a pediatric infectious disease physician and works at Khan Academy.

Renin production in the kidneys

VIDEO 14:09 minutes
Learn the three major triggers for Renin production by the Juxtaglomerular cells. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Activating angiotensin 2

VIDEO 10:20 minutes
See how Renin and ACE work to cut Angiotensinogen down to size! Rishi is a pediatric infectious disease physician and works at Khan Academy.

Angiotensin 2 raises blood pressure

VIDEO 10:40 minutes
See how Angiotensin 2 effects 4 target "organs" to increase blood pressure. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Aldosterone raises blood pressure and lowers potassium

VIDEO 13:18 minutes
See how Aldosterone effects the principal cells of the kidney to raise BP and lower potassium. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Aldosterone removes acid from the blood

VIDEO 11:20 minutes
See how Aldosterone acts on the alpha-intercalated cell to remove protons (acid) from the blood. Rishi is a pediatric infectious disease physician and works at Khan Academy.

ADH secretion

VIDEO 15:05 minutes
Learn the key triggers for ADH secretion. Rishi is a pediatric infectious disease physician and works at Khan Academy.

ADH effects on blood pressure

VIDEO 9:33 minutes
See how ADH acts on blood vessels and the kidney to raise blood pressure. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Aldosterone and ADH

VIDEO 9:47 minutes
Find out how Aldosterone and ADH cause changes in volume and osmolarity. Rishi is a pediatric infectious disease physician and works at Khan Academy.