Summarize the surface barriers that provide a first line of defense against pathogens
What will be an ideal response?
Cutaneous membranes and mucous membranes provide a continuous physical barrier to block the entry of potential pathogens into the body. Skin is relatively resistant to mechanical stress due to several layers of cells filled with keratin. Oil, or sebum, has a slightly acidic pH that deters the growth of most pathogenic organisms and is produced by sebaceous glands in the skin. Mucous membranes also secrete products that discourage pathogen invasion such as mucus or stomach acid.
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A doctor places drops in the eyes to dilate the pupils for an examination. The type of drug that is used is a(n) ________ drug. 1. sympathomimetic 2. parasympathomimetic 3. adrenergic activating 4. cholinergic activating
A) 1, 2 B) 3 C) 4 D) 1, 3 E) 2, 4
Which of the following does NOT result in metabolic alkalosis?
A) lowered body temperature B) decrease in food intake C) constipation D) hyperventilation
The diameter of the airways in normal lungs is generally great enough that little resistance is offered to airflow
Indicate whether the statement is true or false.