A. The brain detects the stretching of the small intestines when food enters, and regulates the progress of chyme from the stomach into the intestine.
B. Emotional stress or depression may alter appetite patterns.
C. Muscular control of peristalsis resulting in mixing of food with digestive enzymes and moving food along the digestive tract.
D. The sight, smell and taste of food can activate saliva production, stomach activity and digestion before it reaches the stomach.
All of the following occur in a countercurrent exchange EXCEPT
a. flow in opposite directions. b. a concentration gradient. c. a large surface area. d. short contact time for exchange
Cholera produces severe diarrhea by ____
a. increasing the rate at which cells pump out ions b. decreasing osmosis in small intestinal cells c. blocking ATP production d. increasing water pumps in small intestinal cells e. blocking sodium and potassium channels
The transfers of motor, sensory, and cognitive information between the brain hemispheres is facilitated by the major neural connection between the right and left hemispheres of the human brain. This "bridge" is called the
A. motor cortex. B. reticular formation. C. basal nuclei. D. thalamus. E. corpus callosum.
Some prokaryotes have specialized internal membranes that __________.
a. have attached ribosomes and function in protein synthesis b. form from infoldings of the plasma membrane and may function in cellular respiration or photosynthesisarose c. from endosymbiosis of smaller prokaryotes, evolving into mitochondria and chloroplasts d. are produced by the endoplasmic reticulum but differ in composition from eukaryotic membranes e. enclose the nucleoid and separate plasmids from the single prokaryotic chromosome