Integumentary system which statement explains the sarcomere appearance change during a muscle contraction
a. the light a bands remain at a constant length
b. the i bands lengthen
c. the i bands will only consist of thin filament
d. the h zone shortens as actin filaments slide towards the m-line

In e. c. tolman's experiment, some rats were trained to run through mazes for standard food goals, while other rats were allowed to explore the mazes for 10 days without food goals or other rewards. later, when food rewards were placed in a box at the far end of the maze, the previously unrewarded rats reached the food box as quickly as the rewarded rats after only one or two trials. this experiment demonstrated that the rats had the ability to form of their surroundings.