Microfilaments are slender protein strands, usually composed of the protein ________.
Fill in the blank(s) with the appropriate word(s).
actin
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Fluid-shifts are controlled by the kidneys and help to maintain optimum blood pressure
Indicate whether the statement is true or false
The building of complex molecules from simpler ones is described as
A. reversible. B. exergonic. C. anabolism. D. catabolism. E. irreversible.
Which of the following skin changes is usually associated with aging?
A. There is an increase in the number of elastic fibers in the skin. B. Skin becomes thicker. C. The amount of collagen in the dermis increases. D. Loss of subcutaneous tissue contributes to sagging of the skin. E. Localized increase in sebaceous glands leads to dry skin.
Answer the following statements true (T) or false (F)
1. The trachea connects the larynx to the primary bronchi. 2. O-shaped rings of cartilage help keep the trachea open even when pressure is applied to it. 3. Complete tracheal obstruction causes death in a matter of minutes. 4. The trachea, primary bronchi, and secondary bronchi all contain cartilage in their walls to help keep them open. 5. The smooth muscle contraction that occurs in an asthma attack most seriously affects the secondary bronchi.