A friend asks you how exocrine glands differ from endocrine glands. She knows that both form from invaginated epithelium. How do you respond?
A. Exocrine and endocrine glands are essentially the same, both produce products that are secreted to the skin's surface.
B. Exocrine glands produce hormones which enter the blood stream, while endocrine glands secrete sweat and oil directly to the surface of the skin.
C. Endocrine glands produce hormones which enter the blood stream, while exocrine glands secrete sweat and oil directly to the surface of the skin.
D. Exocrine glands are found in the thoracic cavity while endocrine glands are located in the pleural cavity.
E. The liver is an endocrine gland that secretes directly into epithelial tissues. The pituitary gland is an exocrine gland that secretes into the blood stream.
C. Endocrine glands produce hormones which enter the blood stream, while exocrine glands secrete sweat and oil directly to the surface of the skin.
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Target tissues for steroid hormones and thyroid hormones do not have membrane receptors for these
hormones because they
a. stimulate the cell by changes in electrical activity. b. are water soluble. c. enter the cell by ion channels. d. are small enough to diffuse directly into the cell. e. are soluble in the lipid bilayer.
The primary structural molecule composing a cell membrane is a(n)
A. sugar molecule attached to a protein. B. phospholipid molecule. C. protein molecule. D. enzyme molecule. E. cholesterol molecule.
Feeding aphids are anesthetized by exposure to
__________ in translocation experiments. a. alcohol fumes b. carbon dioxide c. methane d. high levels of oxygen e. smoke
As air is inhaled, waht is the correct order that the following structures will be encountered?
a) alveoli -> bronchioles -> trachea -> pharynx -> nasal cavities b) pharynx -> nasal cavities -> alveoli -> bronchioles --> trachea c) nasal cavities -> pharynx -> trachea -> bronchioles -> alveoli d) nasal cavities -> trachea -> bronchioles -> alveoli -> pharynx