Excessive ___________ production by skeletal muscles can be associated with pain and muscle fatigue.
Fill in the blank(s) with the appropriate word(s).
lactic acid
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Why aren't insect tracheae associated with capillary beds?
A. Insect capillaries are found only around the gut. B. Insects have an open circulatory system. C. Insects have external gills associated with hemolymph vessels. D. Insects use an air sac respiratory system.
A defect in the transport of ____ ions would have the most direct effect on muscle contraction
a. Cl? b. K+ c. Ca2+ d. Na+Zn2+ e. Zn2+
Four of these five choices are substances that release ozone-destroying chemicals. Select the exception
a. evaporating fossil fuels b. coolants c. solvents d. plastic foam e. propellants in aerosol cans
The latency period of syphilis is ________.
A. 20 years or longer B. 10 years C. 3 to 6 months D. 1 year