Groups of cells within this gland secrete hormones that maintain normal levels of glucose in the body.

• Adrenal

• Pancreas

• Parathyroid

• Thyroid

Cells within this gland secrete a hormone that, in times of emergency, increases the glucose level of the blood and speeds up the actions of the circulatory and respiratory systems.

• Adrenal

• Pancreas

• Parathyroid

• Thyroid

Insulin is secreted by structure

• E

• F

• G

• H

This structure releases a hormone that stimulates the release of other hormones from other glands.

• A

• B

• C

• D

Estrogen is secreted by structure

• E

• F

• G

• H

Testosterone is secreted by structure

• E

• F

• G

• H

Which system is most directly involved in the events represented in the chart?

• Digestive

• Endocrine

• Nervous

• Respiratory

The nucleus of a cell coordinates processes and activities that take place in the cell. Which two systems perform a similar function in the human body?

• skeletal and muscular

• circulatory and respiratory

• digestive and reproductive

• nervous and endocrine

Which row in the chart contains a correct comparison between nervous regulation and chemical regulation?

• A

• B

• C

• D

Which statement best describes the chemical substances secreted by endocrine glands?

• They are secreted in one place and most often act at another.

• They are distributed by the nervous system.

• They are found only in vertebrates.

• They are secreted into specialized ducts for transport.