Extension at the knee involves ________
A) concentric contraction of the hamstring group and eccentric contraction of the quadriceps femoris group
B) eccentric contraction of the hamstring group and concentric contraction of the quadriceps femoris group
C) isometric contraction of the hamstring group and isotonic contraction of the quadriceps femoris group
D) isotonic contraction of both the hamstring group and the quadriceps femoris group
B
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An excess of hydrogen ions in the body fluids can have fatal results because this can
A) break chemical bonds. B) change the shape of proteins, rendering them nonfunctional. C) disrupt tissue functions. D) change body fluid pH. E) All of the answers are correct.
Potassium has a higher concentration
A. inside the cell versus outside the cell, and sodium is also more concentrated inside versus outside the cell. B. inside the cell versus outside the cell, whereas sodium has a higher concentration outside versus inside the cell. C. outside the cell versus inside the cell, and sodium is also more concentrated outside versus inside the cell. D. outside the cell versus inside the cell, whereas sodium has a higher concentration inside versus outside the cell.
Which of the following is likely to occur as a result of bathing the heart with K+, Na+, or Ca2+?
A) The heart stops beating. B) Contractions become weaker. C) Contractions become more forceful. D) Arrhythmias occur.
Many of the muscles in the anterior compartment of the forearm work to _______ the wrist, and they have their origin on the _______ epicondyle of the humerus
A. flex, lateral B. flex, medial C. extend, lateral D. extend, lateral