Cardiovascular .pptx

Begins with the closure of the aortic and pulmonic

This preview shows page 10 - 23 out of 59 pages.

Begins with the closure of the aortic and pulmonic values (S2) and ends with the closure of the AV valves (S1).
Image of page 10

Subscribe to view the full document.

Heart sounds in systole and diastole. Ventricular Contraction Ventricular Relaxation
Image of page 11
Circulation of the Heart Coronary arteries : these arteries feed the heart muscle. A block in one or more can cause an MI. Many times they are stented or bypass surgery is performed. Left main Right coronary Left anterior descending Circumflex Cardiac veins: Serves as the tributary for the majority of venous blood draining. Drains into the coronary sinus.
Image of page 12

Subscribe to view the full document.

Vessels of the heart: Anterior. A
Image of page 13
Vessels of the heart: Posterior. B
Image of page 14

Subscribe to view the full document.

Anatomy and Physiology Jugular venous pressure Reflects right atrial pressure Best estimated from right internal jugular vein Right external jugular vein useful for estimating Central venous pressure ( CVP ) is blood pressure in the vena cava, near the right atrium of the heart. CVP reflects the amount of blood returning to the heart and the ability of the heart to pump the blood back into the arterial system.
Image of page 15
Conduction System of the Heart Sinoatrial (SA) node : pacemaker of the heart, initiates the heartbeat. Intra-atrial pathways : transmit impulse from SA node to right and left atrium. Atrioventricular (AV) node and Bundle of His : are connected and function to receive the current that has spread throughout the atria. Right and left bundle branches : spread impulses through the ventricular myocardium Purkinje fibers : penetrate myocardial tissue
Image of page 16

Subscribe to view the full document.

Conduction system of the heart.
Image of page 17
Electrocardiogram (ECG) Paper Recording of Deflections That Represent the Cardiac Cycle Electrical deflections P wave : atrial depolarization PR interval : time needed for electrical current to travel across both atria and arrive at the AV node. QRS interval : atrial repolarization and ventricular depolarization T wave : ventricular repolarization
Image of page 18

Subscribe to view the full document.

Electrocardiogram wave .
Image of page 19
Cardiac Function Stroke volume Amount of blood that is ejected with each heartbeat Cardiac output Amount of blood ejected from the left ventricle over 1 minute Cardiac index Measurement accounting for an individual’s weight when evaluating the pumping action of the heart
Image of page 20

Subscribe to view the full document.

Pumping Action of the Heart Preload is related to the amount of blood and stretching of the ventricular myocardial fibers . Preload : is the stretch. The amount of blood being returned to the right side of the heart from systemic circulation (the body).
Image of page 21
. Afterload is the pressure that the ventricles must overcome in order to open the aortic and pulmonic valvular cusps Afterload : is the squeeze. The amount of resistance the left side of the heart has to overcome in order to eject blood to the body.
Image of page 22

Subscribe to view the full document.

Image of page 23
  • Fall '19
  • left ventricle, left atrium

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern