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Homeostasis
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Slide 1

Homeostasis

Homeostasis

Maintaining

an

Internal Balance

Slide 2

Homeostasis

Homeostasis

The property of a system, either open or closed, that regulates its internal environment so as to maintain a stable, constant condition.

Multiple dynamic equilibrium adjustment and regulation mechanisms make homeostasis possible.

Source: Wikipedia

Slide 3

Blood Glucose  An Example

Blood Glucose An Example

Glucose is the simple sugar known as blood sugar

Glucose is required for brain function the brain cannot use any other energy source

A healthy body maintains a blood sugar level of between 80 mg/dL and 110 mg/dL (slightly higher right after meals)

Slide 4

The Role of Hormones

The Role of Hormones

When blood glucose levels are low, the hormone glucagon stimulates the conversion of glycogen in the liver to glucose

Glucagon is a peptide hormone made of 29 amino acids. It is produced in the alpha cells of the (α-cells) of the islets of Langerhans, which are located in the pancreas.

Slide 5

The Role of Hormones

The Role of Hormones

When blood glucose levels are high, the hormone insulin stimulates the conversion of glucose to stored glycogen in the liver.

Insulin is a peptide hormone made of 51 amino acids. It is produced in the beta cells of the

(β-cells) of the islets of Langerhans, which are located in the pancreas.

Slide 6

The Role of Hormones

Slide 7

The Role of Hormones

Slide 8

Type I Diabetes

Type I Diabetes

Autoimmune disease destroys the beta cells of the pancreas

Diabetic is dependent on exogenous insulin

There is currently no cure, though there many approaches under research

In North America, 5 10% of diabetics are Type I

Slide 9

Type II Diabetes

Type II Diabetes

A metabolic disorder due to insulin resistance (the cells are insensitive to the insulin that is present)

Onset of disease can be postponed by proper nutrition and exercise

90 95% of North American diabetics are Type II.

20% of the population over age 60 are Type II

Slide 10

Blood Calcium: Example #2

Blood Calcium: Example #2

Ca2+ ion is essential to organisms. It is functions include:

A component of bone

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