Fill in the Blanks AnalogiesOnline version Analogies by Gabriela Hermosillo 1 of tick an fist clock pump bread hollow orange a peel string tock a around pear slice of ball 1 . The shape of the heart is similar to a . 2 . The walls of the heart are fairly thick , approximately like a , at the bottom . On the top , they ? re thinner , about as thin as . 3 . The strips of muscle at the bottom of the heart are like . 4 . The heart is so small . It ? s only slightly larger than a tightly closed . 5 . That ? s the heartbeat . Contraction and relaxation ? very regular and even ? the beat is just like the . 6 . The heart is similar to a . Basically , it pumps blood to the rest of the body