In the tuskegee syphilis experiments, what information did researchers keep from their subjects about their illnesses? a. they were told they had a rare form of syphilis. b. they were not treated for or told they had cancer. c. they were told they had a sexually transmitted infection. d. they were not treated for or told they had syphilis.

Which of the following systems in absorbing oxygen and releases carbon dioxide

Number and variety of living organism; includes genetic, species, and ecological types

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).