Describe and explain the effects of smoking on the functioning of the respiratory system
What will be an ideal response
Nicotine constricts terminal bronchioles to increase airway resistance, as does the increased mucus secretion and swelling of the mucosa. Smoke inhibits the movement of cilia, which allows buildup of substances and microbes normally removed. Over time, smoking leads to destruction of elastic tissue, which decreases compliance, and ultimately to the effects of emphysema.
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The majority of seminal fluid is produced by the ____________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following nerves is labeled E in the diagram?
a) phrenic nerve b) ulnar nerve c) intercostal nerve d) femoral nerve e) tibial nerve
A hormone that can lower blood levels of calcium ion is
A) parathyroid hormone. B) oxytocin. C) thyroxine. D) calcitonin. E) glucagon.
What is the most abundant extracellular cation?
A) chlorine ion B) potassium ion C) magnesium ion D) sodium ion