On a hot August day at the beach, the lifeguard jumped up and ran into the water, throwing a life-buoy to a troubled swimmer calling for help, and pulling her to safety. He was happy to help the swimmer, and once back on the beach, he realized that being
in the water cooled him off a great deal. What form of heat transfer contributed to his feeling cooler?
A) convection
B) radiation
C) conduction
D) evaporation
Answer: A
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The vestibulocochlear nerve first synapses with the ________ in the medulla.
Fill in the blank(s) with the appropriate word(s).
The figure illustrates a detailed drawing of the neuromuscular junction. What does "D" represent?
A. Postsynaptic membrane B. Synaptic cleft C. Synaptic vesicles D. Sarcolemma E. Presynaptic terminal
Which epithelial tissue is found lining the lumen of the stomach and small intestine?
A. Simple cuboidal epithelium B. Simple columnar epithelium C. Pseudostratified columnar epithelium D. Transitional epithelium E. Stratified squamous epithelium
A membrane permeable only to Na+ separates two compartments containing Na2SO4 as shown below
Electrodes are placed in both compartments and a voltage applied (compartment A is held at 0 mV). What voltage applied to compartment B would result in NO net movement of Na+ across the membrane separating the compartments? A. –60 mV B. –30 mV C. 0 mV D. +30 mV E. +60 mV