Exam 3 REVIEW Physiology

Thrombin is an enzyme needing calcium as a cofactor to convert fibrinogen into fibrin threads - ANSWER-True Graded skeletal muscle contractions is due to differing numbers of simultaneously active motor units - ANSWER-True Since fenestrated capillaries, are the most porous, they are found abundantly in the brain to allow oxygen to readily diffuse into the local nervous tissue - ANSWER-False *They are not the most porous but they do have holes Frank Starling Law describes an intrinsic property of heart muscle (myocardium) where contractile force increases with an increase in myocardial stretch - ANSWER-True Muscles with high proportions of large motor units provide finer muscle control (precise motor control) - ANSWER-False *Small motor units have high proportions to provide finer muscle control Recruitment is the process of increasing number of contracting motor units to generate increased muscular contractile force - ANSWER-True Tachycardia is defined as abnormally slow resting heart rate - ANSWER-False *Tachy=Fast Brady=Slow Plasma is fluid por