Explain the nervous system's control of the respiratory system.
What will be an ideal response?
The rhythm of ventilation is controlled by a respiratory control center located in the medulla oblongata of the brain. The respiratory control center automatically sends out a nerve signal to the diaphragm and the external intercostal muscles of the rib cage. This causes inspiration to occur. When the respiratory center stops sending nerve signals to the diaphragm and the rib cage, the muscles relax and expiration occurs.
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Which of the following are NOT found in the gastrointestinal tract of healthy humans?
A) Bacteroides B) Clostridium C) Escherichia coli D) protists
Which of the following statements is false regarding phagocytosis?
A) It involves ingestion of large particles by the cell. B) It involves the projection of pseudopodia. C) It is a method used predominantly by amoeba to obtain food. D) It is mediated by clathrin at the plasma membrane. E) In vertebrates, macrophages and neutrophils possess this ability.
What key words does the question contain and what do they mean?
What will be an ideal response?
A chemical reaction that occurs in the absence of oxygen; an example is the fermentation reactions.
What will be an ideal response?