Heart function definitions

Heart function definitions

1. Venous return

   • the mechanisms that return blood to the heart

2. Starlings law of the heart

   • the greeter the venous return, the greater the strength of the contraction

3. atrio-ventricular node

   • tissue found in the trio ventricular septum that from part of the heart conductive systems

4. perkinje fibers

   • specilised nerev fibres found in the ventricls

5. Stroke volume

   • volume of blood leaving the left ventricle per beat

6. intrinsic

   • tha name given to the idea that the heart generates its own contraction from with in the heart ( the heart is self paced )

7. sino-atrial node

   • small mad of cardiac tissue located in the wall of the right atrium which generates the heart beat

8. systemic circulation

   • blood circulation from the heart to the body and then back to the heart

9. Cardiovascular drift

   • an increases in the heart rate that occurs during prolonged exercise that compensates for the decreased in the stroke volume in an attempt to maintain cardiac output

10. Bradycardia

    • the reduction in the testing heart rate that accompanies traning

11. Hypertrophy (athletes heart)

    • the increased size of the heart, focused on the increased size of the left ventricle

12. Chemoreceptors

    • group of cells that detect changes in the blood acidity

13. Cardiac output

    • volume of blood leaving the left ventricle per minute (stroke volume X heart rate)

14. Ejection fraction

    • proportion of blood in left ventricle pumped out each beat

15. bundle of his

    • specialised bindles of nerve tissues found in the interventricular septum that form part of the hearts conductive system

16. pulmonary circulation

    • blood circulation from the heart to the lungs and the returns to the heart

17. myogenic

    • impulses generated without nervous stimules