Please enable JavaScript.
Coggle requires JavaScript to display documents.
Anatomy and physiology (Key definitions (HEART RATE- Number of times the…
Anatomy and physiology
-
Stroke volume
-
Starlings law
-
-
- Cardiac muscle is stretched
- Greater diastolic fillings(filling at rest)
-
- Increased ejection fraction
-
-
-
Cardiovascular drift
-
Occurs 10 mins into steady exercise in warm environment, fluid is lost through sweat.
-
-
-
-
Blood pressure
-
-
-
When heart contracts it forces blood out under high pressure. This is called systolic pressure. Lower pressure as ventricles relax is called diastolic pressure
Venous return mechanisms
-
-
Respiratory pump
When muscles contract and relax during breathing, pressure changes occur in the chest cavity which compress nearby veins squeezing blood back to heart
-
-
-
Redistribution of blood
Redirection of blood flow to working muscles mean that sports performers should ensure that they don't eat an hour before competition
-
-
-
-
Control of blood flow
-
- Chemoreceptors detect increase in CO2 and acidity/ Baroreceptor detect increase in blood pressure
- Vasomotor centre in the medulla
- Vasodilation in arterioles at muscles+pre-capillary sphincters relax./ Vasoconstriction in arterioles at non-active tissues+pre capillary sphincters contract
-
-
-