Chemical Coordination and Integration – Solutions

1. Define the following:

a.Exocrine gland

b. Endocrine gland

c. Hormone

Solution:

1. Exocrine gland: Gland that discharge their secretions into ducts are known as exocrine glands. For example, the secretion produced by the parotid glands enters the oral cavity through Stensen’s duct.

2. Endocrine gland: Gland that discharge their secretions into the blood is known as endocrine glands. Since ducts are not needed, these gland is also known as ductless gland. The pituitary gland, thyroid gland and adrenal gland are examples of endocrine glands.

3. Hormone: Hormones are chemicals released by cells that affect cells in other parts of the body. Only a small amount of hormone is required to alter cell metabolism.