Ceroid pigments and lipofuscin accumulate with aging, impairing a cell's ability to withstand the damaging effects of oxygen free radicals.
Answer the following statement true (T) or false (F)
True
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If a lever operates at a mechanical disadvantage, it means that the ________
A) effort is farther than the load from the fulcrum B) load is near the fulcrum and the effort is at the distal end C) lever system is useless D) load is far from the fulcrum and the effort is applied near the fulcrum
Smoking destroys cilia in the respiratory passageways, such as the trachea. Which of the following is a likely consequence of damaged cilia?
A) inflammation and swelling of the tonsils B) air is not moistened, warmed, or filtered before reaching the lungs C) inability to propel mucus from the lungs to the throat D) nasal congestion and postnasal drip E) inability to produce mucus
Which describe complement? Choose all that apply.
A. Most complement proteins are made by T lymphocytes. B. One type of complement protein is interferon. C. Some can poke holes in bacteria and cause them to rupture. D. They are a group of plasma proteins.
Which endocrine gland secretes calcitonin?
A. Pituitary B. Testes C. Thyroid D. Parathyroid