HK 2810 Study Guide - Midterm Guide: Vascular Smooth Muscle, Sympathetic Nervous System, Osmotic Concentration

• School: University of Guelph
• Department: Human Kinetics
• Course: HK 2810
• Professor: Coral Murrant

Document Summary

Test 3 questions and answers: diagram the action potential of a cell in the sinoatrial node and describe the ion movement and channels involved in establishing this action potential. While running to catch the bus an increase in sympathetic nervous system (sns) output to sinoatrial nodal cells can increase heart rate to 120 beats per minute. Explain, in detail, the changes in the heart due to an increase in sns output to the sa node and how these changes would affect pressure in the aorta. Ca++ flux in a k c h a n n e l. S l o w n a + l u x. N a + f e l i n. Increases permeability to na+ (and ca++) therefore hit threshold faster therefore increase depolarization rate, therefore increase heart rate. Increased heart rate would increase co, increase vol. in aorta and increase pressure in the aorta.