Kinesiology 3339A/B Lecture Notes - Lecture 29: Skeletal Muscle, Stroke Volume, Osmotic Concentration

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 3339A/B
• Professor: Peter Lemon

Document Summary

Fluids continued: osmolality (tonicity) is a measure of the solutes in solution. 1 molecule of any non-ionic substance (glucose) = 1 osmol (1 millimol = 1 mosmol) Electrolytes (sodium, chloride, potassium, bicarbonate, sulfaste, magnesium, calcium: functions. Charged particles in solution that conduct an electric current (ions) - nerve impulse. Control metabolic reactions by activating enzymes: sodium. Involved in fluid balance and blood pressure control. Deficiency rare because intake high and regulated via aldosterone from adrenal cortex (kidneys to retain sodium) and adh from pituitary gland (kidneys retain water) Loss in sweat easily replaced in subsequent meals: chloride. As with sodium, losses in sweat easily replaced: potassium. Fluid balance, electrical impulse in both cardiac and skeletal muscle. Deficiency life threatening (due to impaired cardiac function) but rare as tightly regulated by aldosterone (kidney increases potassium loss)