Cardiovascular System & Exercise Flashcards
Ejection Fraction Percent of blood?
55%a
Equation for CO
CO=SVxHR
What is the name for Cardiac Output
Fick Equation
Fick’s Equation =
CO= [VO2/(A-V)] * 100
What does a-v stand for
how much O2 the muscles extract for work
Average cardiac output for male and female
male 5 L/min
female 4 L/min
how many ml O2/L of blood
200 ml O2/L of blood
if 5 L CO, whats the mL oxygen available?
1000ml O2
how much O2 in ml/min is used?
250-300 ml/min O2 @ rest
What is our O2 reserve?
750ml O2 reserve
1L blood = ? O2
200ml
Direct neural supply of HR is by
Ventro-Lateral Medulla
What are the 2 systems of indirect HR control (increasing HR?)
SNS and PNS
What 2 SNS chemicals and 2 effects on HR?
Catecholamines- epinephire and norepinephrine
+chronotropy
+inotropy
What is the 3rd indirect system (only) that decreases HR?
Vagus nerve
How does Vagus nerve affect HR? Chronotropy or Inotropy?
- chronotropy (rate)
NO inotropy
when does mycardium reciegve blood
diastole
Is heart muscle aerobic or anaerobic
Myocardium is Aerobic
3 sources of energy for heart?
glucose
fatty acid
lactate from glycolysis in muscle
@ rest, heart extracts __? O2 from coronaries?
70-80% O2 from coronaries