The nervous system can directly affect the activities of the digestive system locally through the collection of neurons within the walls along the gastointestinal tract. How might the brain exert its regulation of digestion from a distance?
_____ The sight, smell and taste of food can activate saliva production, stomach activity and digestion before it reaches the stomach.
_____ The brain detects the stretching of the small intestines when food enters, and regulates the progress of chyme from the stomach into the intestine.
_____ Muscular control of peristalsis resulting in mixing of food with digestive enzymes and moving food along the digestive tract.
_____ Emotional stress or depression may alter appetite patterns.
__X__ The sight, smell and taste of food can activate saliva production, stomach activity and digestion before it reaches the stomach.
_____ The brain detects the stretching of the small intestines when food enters, and regulates the progress of chyme from the stomach into the intestine.
_____ Muscular control of peristalsis resulting in mixing of food with digestive enzymes and moving food along the digestive tract.
__X__ Emotional stress or depression may alter appetite patterns.
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When all continents were fused into one during the Permian Period, they were called
a. Laurasia. b. Pangaea. c. Gondwanaland. d. Eurasia. e. Amerasia.
The blood pressure in the veins of your toe is most likely higher than the blood pressure in the arteries
of your little finger. ____________________ Indicate whether the statement is true or false.
The diarrhea associated with enterotoxigenic Escherichia coli (ETEC) is the result of:
A. Plasmid-mediated invasion and destruction of epithelial cells lining colon B. Mediated by cytotoxic Shiga toxins (STx-1, STx-2), which disrupt protein synthesis C. Plasmid-c, heat-stable and/or heat-labile enterotoxins that stimulate hypersecretion of fluids and electrolytes D. Plasmid-mediated A/E histopathology with disruption of normal microvillus structure resulting inmalabsorption and diarrhea
Which of the following mechanisms helps keep the stomach lining in place despite the destructive force of gastric juice?
A) digestion of protein by pepsin B) secretion of acid-neutralizing compounds C) generation through mitosis of new cells to replace the stomach lining D) protection of the cells of the stomach-lining by parietal cells