Midterm 2011W

Voltage gated channels in the membrane b permanently

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Unformatted text preview: oltage-gated channels in the membrane. B. permanently open potassium channels in the membrane. C. the myelin sheath. D. chemically-gated channels in the membrane. E. the release of neurotransmitters. MCDB 1B Midterm Green (2) Version: 2 Page: 1 7. Match the immune cells on the left with their characteristic on the right. (Answers on the right may be used more than once or not at all) 1. neutrophil w. undergoes several rounds of oxidative bursts. 2. macrophage x. Releases histamine to trigger inflammation. 3. mast cell y. Most numerous leukocyte in the body. z. Antigen presenting cell. A. 1w, 2y, 3x, 1z B. 1z, 2y, 3w, 3x C. 1y, 2z, 3x, 1w D. 1y, 2z, 3x, 2w E. 1z, 2w, 3y, 3x 8. Saltatory conduction results when A. action potentials spread from node to node down the axon. B. the neuron cannot immediately propagate another action potential. C. neurons become demyelinated. D. a nerve impulse jumps from one neuron to another. E. the threshold for an action potential is suddenly increased. 9. Which of the following statements about a sensory cell is FALSE? A. Encodes the intensity of the stimulus by the frequency of action potentials produced. B. They can become insensitive to a source of continuous stimulation. C. They are specialized for detecting specific kinds of stimuli. D. Their receptor proteins span the plasma membrane. E. Always fires an action potential in response to a stimuli. 10. Which of the following statements about movement of food in the gut is FALSE? A. The lower esophageal sphincter controls entry of food into the stomach. B. The pyloric sphincter controls the exit of chyme. C. The epiglottis and larynx prevent food entry into the trachea. D. The waves of muscle contraction that propel food through the gut are called peristalsis. E. The duodenum is the site where most of the food absorption occurs. 11. Match the antibody class on the left with their characteristic on the right. (Answers on the right may be used more than once or not at all) 1. IgA w. most...
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This test prep was uploaded on 02/13/2014 for the course MCDB 1B taught by Professor Weimbs during the Winter '08 term at UCSB.

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