In an isotonic contraction, the muscle ________
A) does not change length, but increases in tension
B) changes in length and moves the "load"
C) never converts pyruvate to lactic acid
D) rapidly resynthesizes ATP
B
Explanation:
A) The muscle changes length in an isotonic contraction.
C) Pyruvate converts to lactic acid when there is a lack of oxygen.
D) ATP is not always rapidly resynthesized by the cell.
Exercise 22: Post-Lab Questions
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Imagine a beaker divided down the center by a rigid membrane that is freely permeable to water but impermeable to glucose. Side 1 contains a 10 percent glucose solution and side 2 contains the same volume of pure water. At equilibrium, what will be the situation?
A) Water will continue to move from side 1 to side 2. B) Water will continue to move from side 2 to side 1. C) The volume of liquid will be greater in side 1. D) The volume of liquid will be greater in side 2. E) The volume of liquid remain equal on both sides.
All but one of the following is a function of the low pH found in the stomach. Select the description below that does not reflect a role of stomach acid
A) The stomach's acid catabolically breaks down food stuffs in preparation for absorption. B) Stomach acid denatures proteins making the poly peptide chain more accessible to pepsin digestive enzymes. C) Many potentially harmful bacteria will be prevented entry to the small intestine by stomach acid. D) Low pH converts pepsinogen to its active form of pepsin, preventing the protease enzyme from digesting the cells that produce it.
The ________ glands are a source of sex pheromones.
A. ceruminous B. merocrine C. apocrine D. sebaceous E. mammary
The orbicularis oculi muscle
A. puckers the mouth for kissing. B. contributes to laughing and smiling. C. causes crow's feet wrinkles. D. raises the eyelid. E. contributes to pouting.