1. : the final chemical messenger and "trigger" for muscle contraction. it binds to troponin. 2. : a neurotransmitter released at motor end plates by the axon terminals. 3. : it diffuses across the cell membrane resulting in depolarization. 4. : activates synaptic vesicles in axon terminals to fuse with plasma membrane of axon terminal. 5. : where the axon of a motor neuron connects with the muscle fibers. 6. : breaks down ach into its building blocks, rendering it inactive.

Look at the picture below . what does this picture represent ?

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Monarch butterflies have brightly colored orange wings with black patterns on them, making them easily visible to birds that eat butterflies and moths, yet birds rarely eat the monarchs. likewise, the monarch caterpillars are brightly striped yellow and white and black, and they also are rarely eaten by birds, although some wasps will attack them and feed them to their young. what can be inferred from these observations? monarchs must threaten and attack birds, but not wasps. monarchs have a way of discouraging bird predation that does not involve hiding. monarchs’ wings are so colorful that most birds must find them difficult to eat. monarchs lay more eggs than other less conspicuous butterflies.