a) Why do patients with myasthenia gravis experience skeletal muscle weakness but generally do not experience symptoms relating to smooth or cardiac muscle weakness such as reduced intestinal motility or cardiac arrhythmias? b) What are neuroendocrine cells? Describe their location and function in the adrenal gland.

over a period of 3 years , a 40 year old man develops generalized dystonic , hyperkinetic movements and progressive dementia , his mother and one sister have a similar disease but his father and another sister are healthy. which of the following lesions is mostly likely to be present in the cerebral nervous system of the patient and his affected family members. A) atrophy  of the caudate nuclei, B) loss of pigmented cells in the sustengria nigra, C) microglial nodules and multinucleated giant cells in the white matter, D) neurofibrillary tangles in the cortical neurons, E) spongiform changes in the cerebral cortex

3) Which of the following describes the sympathetic branch of the autonomic nervous system? a) Long myelinated preganglionic fibers, short nonmyelinated postganglionic fibers b) Long nonmyelinated preganglionic fibers, short myelinated postganglionic fibers c) Short myelinated preganglionic fibers, long nonmyelinated postganglionic fibers d) Short nonmyelinated preganglionic fibers, long myelinated postganglionic fibers

Please help me