Question 17 (6 points). Vultures, which are classified as scavengers, are an important part of an ecosystem because they cause the decay of dead organisms, which releases usable energy td-herbivores and carnivores are the first level in food webs and make energy available to all the other organisms in the web hunt herbivores, limiting their populations in an ecosystem feed on dead animals, which aids in the recycling of environmental materials

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).