The tracheal cartilage consists of pieces of cartilage adjacent to the trachea with the opening
A. anterior.
B. posterior.
C. lateral.
D. There are no openings in the tracheal cartilage.
Answer: B
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Each of the following factors promotes the function of the capillaries except
a. a blood pressure forcing fluid out of these vessels. b. a small total surface area. c. an osmotic pressure drawing fluid into these vessels. d. pores in the endothelial wall. e. thin walls.
Acetylcholine binds to ________ receptors of the heart and causes the opening of ________ channels.
A. muscarinic; Na+ B. muscarinic; K+ C. nicotinic; K+ D. nicotinic; Na+
Examples of physical barriers against pathogens include all of the following except
A) sebaceous glands. B) mucus. C) epithelia. D) epidermal layers. E) blood.
Aging affects the appearance of the skin, producing wrinkles and sagging due to
decreased collagen and elastin formation. Indicate whether the statement is true or false