Hondros 253 A&p Final Exam With 165 Questions And Answers

Pumps blood out to lungs {Ans: Right Ventricle}Subdivisions of ANS {Ans: 1. Most organs are innervated by both divisions of the ANS 2. Sympathetic division - Preganglionic fibers arise from thoracic and lumbar regions - Synapse with postganglionic neurons in ganglia near spinal cord - All preganglionic neurons use acetylcholine - Sympathetic postganglionic neurons use norepinephrine 3. Parasympathetic division - Preganglionic fibers arise from brain stem and sacral region of spinal cord - Synapse with postganglionic neurons in ganglia close to visceral organs - All preganglionic neurons use acetylcholine - Parasympathetic postganglionic use acetylcholine}Schwann Cell {Ans: Only in PNS; Tightly wrapped myelin forces nucleus to outer portion; Outermost layer=Neurolemma}Reflexes {Ans: Rapid, involuntary and predictable responses to internal and external stimuli}Resting Potential {Ans: Sodium (Na+) ions are outside the cell membrane and Potassium (K+) ions are inside the cell membrane}sensory {Ans: afferent}