1 / 16

11.4 The Cardiac Cycle and Circulation

11.4 The Cardiac Cycle and Circulation. Pages 495-500. Heart Diagram. Heart Facts. Right side of heart pumps blood to the lungs Left side of heart pumps blood to the body. Beats. 100 000 times each day. Pericardium. 2-layered fluid-filled membrane for protection. Coronary blood vessels.

tamera
Télécharger la présentation

11.4 The Cardiac Cycle and Circulation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 11.4 The Cardiac Cycle and Circulation Pages 495-500

  2. Heart Diagram

  3. Heart Facts • Right side of heart pumps blood to the lungs • Left side of heart pumps blood to the body

  4. Beats • 100 000 times each day

  5. Pericardium • 2-layered fluid-filled membrane for protection

  6. Coronary blood vessels • Supplies heart muscle with blood • Meet high O2 demand of heart (10% of total O2)

  7. Pathway of blood • Body right atrium right ventricle pulmonary artery lungs  pulmonary vein  left atrium left ventricle aorta  body

  8. Blood vessels • Heart arteries arterioles capillaries venules veins heart

  9. Valves Semilunar valves between • Right ventricle and pulmonary artery • Left ventricle and aorta Atrioventricular valves between Atria and ventricles Bicuspid (left), tricuspid (right)

  10. Purpose of valves • Valves prevent blood from travelling backwards

  11. Cardiac cycle • Diastole: period of relaxation and filling of the heart • Systole: period of contraction and emptying of the heart

  12. Atria fill, AV and SL valves are closed • AV open, blood spills into ventricles • Atria contract, filling ventricles • Ventricles begin to contract, AV forced shut, SL remain shut. • Ventricles contract, SL forced open, blood pushed into arteries

  13. Sounds lubb-Dubb • lubb…AV valves close as ventricles contract • Dubb…SL valves slam shut as ventricles begin to relax

  14. Myogenic Muscle • Heart beat originates in the muscle tissue itself • Sinoatrial (SA) node (pacemaker) • Atrioventricular (AV) node ( • Purkinje fibres…conducting nerves

  15. Nervous Systems • Sympathetic nervous system (fight or flight) • Parasympathetic nervous system (rest and digest)

  16. Electrocardiograph • ECG P-SA node stimulus QRS complex- stimulus via Purkinje fibres T-recovery period

More Related