IB Biology Topic D3.3.3 Regulation of Blood Glucose as an Example of the Role of Hormones in Homeostasis Revision Notes (SL/HL)

IB Biology Topic D3.3.3 Regulation of Blood Glucose as an Example of the Role of Hormones in Homeostasis Revision Notes (SL/HL) | RevisionDojo

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Insulin and Glucagon Keep Blood Glucose Within a Narrow Range

Blood glucose must be held steady as part of homeostasis.
Two hormones from the pancreas control it: insulin lowers blood glucose and glucagon raises it.
They act in opposition, so glucose stays within a narrow, healthy range.

Analogy

Picture a see-saw that must stay level.
Insulin pushes one end down to lower blood glucose.
Glucagon pushes the other end down to raise blood glucose.
Only one hormone dominates at a time, never both together.

The Pancreas Both Senses Glucose and Releases the Hormones

The pancreas acts as both the sensor and the responder for blood glucose.
The hormones come from clusters of cells called the islets of Langerhans.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Insulin and Glucagon Keep Blood Glucose Within a Narrow Range

Blood glucose must be held steady as part of homeostasis.
Two hormones from the pancreas control it: insulin lowers blood glucose and glucagon raises it.
They act in opposition, so glucose stays within a narrow, healthy range.

Analogy

Picture a see-saw that must stay level.
Insulin pushes one end down to lower blood glucose.
Glucagon pushes the other end down to raise blood glucose.
Only one hormone dominates at a time, never both together.

The Pancreas Both Senses Glucose and Releases the Hormones

The pancreas acts as both the sensor and the responder for blood glucose.
The hormones come from clusters of cells called the islets of Langerhans.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic D3.3.3: Regulation of Blood Glucose as an Example of the Role of Hormones in Homeostasis Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Insulin and Glucagon Keep Blood Glucose Within a Narrow Range

The Pancreas Both Senses Glucose and Releases the Hormones

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Insulin and Glucagon Keep Blood Glucose Within a Narrow Range

The Pancreas Both Senses Glucose and Releases the Hormones

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account