Human intelligence is most closely related to the
A. amount of cerebrospinal fluid.
B. number of active synapses.
C. number of neurons.
D. size of the brain.
E. weight of the brain.
Answer: B
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Which of the following is NOT a stimulus for breathing?
A) rising blood pressure B) arterial PO2 below 60 mm Hg C) acidosis resulting from CO2 retention D) rising carbon dioxide levels
In excitation-contraction coupling,
A. myosin heads bind to exposed active sites on actin. B. ATP binds to actin myofilaments. C. Ca2+ must bind with myosin to expose active sites on actin. D. movement of the troponin-tropomyosin complex causes actin myofilaments to slide. E. cross-bridges form between myosin heads and Ca2+.
The 6 major breeds of sheep are:
What will be an ideal response?
The five functional types of epithelia are listed below. Match each type with its location and/or description.
1. Found in the epidermis, esophagus, and mouth, these stacked layers of cells prevent exchange, while they resist chemicals, bacteria, and other destructive forces. 2. This tissue actively and selectively regulates the exchange of nongaseous material, such as ions and nutrients, and can be regulated in response to various stimuli. 3. These thin, flattened cells allow the rapid passage of O2 and CO2 through the cells of the lungs and of certain blood vessels. 4. These cells produce a substance and release it, either onto a surface or directly into the blood. 5. This tissue is composed of cells with membrane extensions that beat in a coordinated fashion to move fluid and particles across the tissue. A. exchange B. transport C. ciliated D. protective E. secretory