Compare the body wall of a hydra with that of a tapeworm. Make a schematic diagram of a typical myelinated motor neuron. Make the diagram the size of a full page and label it completely. Discuss the mechanism of synaptic transmission. Discuss each of these responses.
Many aquatic animals excrete ammonia, birds and reptiles excrete uric acid, and man excretes urea.
Describe the formation of two of these waste products and discuss the adaptive value of these three methods of nitrogenous excretion. Describe one such feedback system, discussing the evidence which indicates that feedback occurs. Describe the anatomy and physiology of the autonomic nervous system of vertebrates. The transmission of an impulse from a nerve to the surface of a resting muscle initiates a contraction in that muscle. Biochemical and biophysical studies of muscle tissue have resulted in an explanation for muscle contraction known as the sliding- filament theory.