What is the purpose of the cartilaginous rings in the trachea?
A. They lend stability to the neck.
B. They maintain an open passageway for food.
C. They maintain an open passageway for air.
D. They support smooth muscle.
E. They provide a smooth, slick, passageway for air.
C. They maintain an open passageway for air.
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Restlessness is a symptom of hyperthyroidism.
Answer the following statement true (T) or false (F)
The cell types of the alveoli include which of the following?
A) goblet cells B) pseudostratified, ciliated, and columnar epithelia C) mucus glands D) macrophages E) All of the answers are correct.
The efferent division of the PNS is divided into the ____________________ nervous system, which innervates skeletal muscles, and the ____________________ nervous system, which innervates smooth muscle, cardiac muscle, and glands
Fill in the blank(s) with correct word
One type of experimental contraceptive device is a skin patch that contains a chemical absorbed through the skin. Which of the following substances might be the type of chemical involved?
A. proteins B. carbohydrates C. lipid-soluble substances D. amino acids E. water-soluble substances