Explain how smoking impairs the protective features of the epithelium of the respiratory tract
What will be an ideal response?
Chemicals in cigarette smoke increase mucus secretion by goblet cells in the epithelium lining the respiratory tract. Those chemicals also paralyze and eventually destroy the cilia responsible for sweeping along contaminated mucus. Although more mucus is available, the natural mechanism for removing it is impaired. A smoker's cough develops as the only way the body can prevent mucus buildup.
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Describe the process of spermiation
A) During spermiation, a primary spermatocyte becomes a secondary spermatocyte. B) During spermiation, a secondary spermatocyte becomes a spermatid. C) During spermiation, a spermatid becomes a sperm. D) During spermiation, a sperm loses its tail. E) During spermiation, a sperm loses its attachment to the nurse cell and enters the lumen of the seminiferous tubule.
T cells achieve immunocompetence in the ________
A) spleen B) bloodstream C) liver D) thymus E) bone marrow
Match the following:
A) Myosin B) Z discs C) A band D) I band 1) A sarcomere is the distance between two ________. 2) The ________ contains only the actin filaments. 3) The thicker filaments are the ________ filaments. 4) Both actin and myosin are found in the ________. 5) The myosin filaments are located in the ________.
The __________ is the space found between the soft palate and root of the tongue.
Fill in the blank(s) with the appropriate word(s).