Bronchioles are kept open by
A. plates of cartilage.
B. smooth muscle.
C. rings of cartilage.
D. skeletal muscle.
E. layers of epithelium.
Answer: B
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Foreign particles that are not filtered out by the respiratory epithelium are
A. dissolved by enzymes in the alveoli. B. coughed up during normal daily activities. C. collected by lymph nodes. D. carried away in blood. E. stored in nearby pulmonary alcoves.
Answer the following statements true (T) or false (F)
1. Because lymph vessels are very low-pressure conduits, movements of adjacent tissues are important in propelling lymph through the lymphatics. 2. Lymphoid tissue is mainly reticular connective tissue. 3. Lymphocytes reside temporarily in lymphoid tissue, then move to other parts of the body. 4. An infected lymph gland is called a bubo. 5. When tissues are inflamed, lymphatic capillaries develop openings that permit uptake of large particles such as cell debris, pathogens, and cancer cells.
The major secretory products of the zona glomerulosa of the adrenal cortex are ________.
A. mineralocorticoids B. androgens C. cortisol and ADH D. glucocorticoids E. catecholamines
The palm of the hand is formed by the ________ bones.
Fill in the blank(s) with the appropriate word(s).