The Big Picture

The Pineal Gland

Shows the location of the pineal gland in the human body.

Unlabelled figure, page 902, Campbell's Biology, 5th Edition

The Thyroid Gland

Shows the location of the thyroid gland in the human body.

Unlabelled figure, page 903, Campbell's Biology, 5th Edition

Tyrosine, T3, and T4 Comparison

Compares the molecular structures of tyrosine, T3, and T4.

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Thyroid Hormones: Function of T3 and T4

Negative Feedback: How Levels of T3 and T4 Are Controlled

Demonstrates the negative feedback system through which T3 and T4 levels are controlled.

Modified figure 45.9, page 903, Campbell's Biology, 5th Edition

The Third Thyroid Hormone: Function of Calcitonin

Parathyroid Glands

Produce parathyroid hormone, which raises calcium levels in the blood two ways:

Shows the location of the parathyroid glands in the human body.

Unlabelled figure, page 904, Campbell's Biology, 5th Edition

Homeostatic Control of Calcium Levels in the Blood is Mediated by Calcitonin and Parathyroid Hormone

Demonstrates the antagonistic hormone system that regulates blood calcium levels.

Figure 45.10, page 905, Campbell's Biology, 5th Edition

Pancreas: Islets of Langerhans

Shows the location of the pancreas in the human body.

Unlabelled figure, page 904, Campbell's Biology, 5th Edition

Glucagon and Insulin: Antagonistic Hormones That Control Blood Glucose Levels

Demonstrates the antagonistic hormone system that regulates blood glucose levels.

Figure 45.11, page 906, Campbell's Biology, 5th Edition

Problems with Blood Glucose: Diabetes Mellitus

Two Types of Diabetes

Two Ways to Control Hormone Levels and Maintain Homeostasis