Which statement about muscle fatigue is false?
A. Muscle cells become less able to respond to nerve stimuli.
B. The muscle may weaken to the point of being unable to respond.
C. Lactic acid build up is a slow process so activity fueled by anaerobic respiration can be extended.
D. The levels of lactic acid in the muscle build up during muscle fatigue.
Answer: C
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The eyelids are connected at the
A) palpebral fissure. B) medial and lateral angles. C) lacrimal caruncle. D) chalazion. E) conjunctiva.
All of the following are true of the pigment melanin except that it
A) decreases in concentration within cells during exposure to the sun. B) is usually some shade of brown or black. C) protects DNA from the damaging effects of UV radiation. D) is released through melanosomes. E) is produced by cells called melanocytes.
The pituitary gland is located within this structure
A) the perpendicular plate of the ethmoid bone B) hypoglossal canal C) crista galli D) sella turcica of the sphenoid bone E) petrous part of the temporal bone
Which of the following choices most accurately represents the sequence of steps occurring in the contraction cycle? The events numbered 1 through 6 may be used more than once. 1 . Mysoin binds ATP 2 . Mysoin hydrolyzes ATP and goes into cocked position 3 . Myosin releases ADP and inorganic phosphate 4 . Myosin binds actin filament 5 . Power stroke 6 . Myosin releases actin filament
a. 1, 2, 3, 4, 5, 6, 1 b. 1, 2, 4, 3, 5, 1, 6 c. 1, 6, 2, 4, 3, 5, 1, 6 d. 1, 2, 6, 3, 4, 5, 6, 1 e. None of these.