1 / 14

Physiology of the Heart

Physiology of the Heart. Conduction on The Heart. Nodal system Enforces a contraction rate of approx 75 beats per minute Sinoatrial node (SA) “Pace maker” Right atrium Atrioventricular node (AV) Between atria and ventricles. Conduction continued. SA node starts heart beat

thao
Download Presentation

Physiology of the Heart

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. Physiology of the Heart

  2. Conduction on The Heart • Nodal system • Enforces a contraction rate of approx 75 beats per minute • Sinoatrial node (SA) “Pace maker” • Right atrium • Atrioventricular node (AV) • Between atria and ventricles

  3. Conduction continued • SA node starts heart beat • Impulse travels across heart to apex and “wrings” the heart

  4. Cardiac Cycle and Heart Sounds • Systole- Contraction • Diastole- Relaxation

  5. Mid-to-late diastole • Pressure is low • Heart relaxed • AV valves open semilunar valves closed • Blood flowing from artia to ventricles

  6. Ventricular systole • Contraction • Pressure in ventricles high • AV valves closed • Atria filling • Ventricles push blood out

  7. Early diastole • Semilunar valves shut • Ventricles closed • AV valves open when pressure in atria is higher than ventricles

  8. Heart Sounds • Lub- closing of AV valves • Dub- closing of semilunar valves at end on systole

  9. Cardiac Output • Amount of blood pumped by each side of heart in 1 minute • CO= HR x SV • HR= heart rate • SV= stroke volume

  10. Blood Pressure • Pressure blood exerts against the inner walls of the blood vessels

  11. Measuring blood pressure • Systolic Pressure- pressure in arteries at the peak ventricular contraction usually 120or less • Diastolic Pressure- pressure during ventricular relaxation usually 80 or less

  12. Blood Pressure problems • Hypertension • High blood pressure • May be due to arteriosclerosis (clogged arteries) • Hypotension • No cause for concern • Usually result of physical conditioning

  13. Heart Problems • “Heart attack” • Myocardium deprived of oxygen (angina) • May cause fibrillation which makes heart useless • “Heart murmur” • Blood flow not smooth • Usually caused by faulty valves

  14. More Heart Problems • Atherosclerosis • Plaque build-up on blood vessel walls • Usually need balloon surgery or lasers

More Related