Chapter 28 - Chapter 28 Part 1 Cardiology Cardiology the...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 28, Part 1 : Cardiology Cardiology - the study of the heart and it’s function Cardiovascular disease (CVD)- disease affecting the heart, peripheral blood vessels, or both. Coronary heart disease (CHD)- a type of CVD; the single largest killer of Americans. Cardiovascular Anatomy Mediastinum - Three tissue layers of the heart 1. Endocardium - the innermost layer 2. Myocardium - the muscular middle layer Epicardium - outer later of the heart 3. Pericardium - the protective sac surrounding the heart 4 Chambers of the heart 1. Atria- Superior Right & Left 2. Ventricle- Inferior Right & Left Heart Valves Mitral Valves o Mitral valve - between the left atrium and Ventricle o Tricuspid valve - between the right atrium and ventricle Semi-lunar Valves o Aortic valve - between the left ventricle and aorta o Pulmonary valve - between the right ventricle and pulmonary artery. Vessels o Arteries Pulmonary artery- takes O2 deficient blood to the lungs to get reoxygenated. Aorta o Veins Vena Cava- brings deoxygenated blood from the body back to the heart (right atrium) Superior Vena Cava Inferior Vena Cava Pulmonary Vein- takes Oxygenated blood back to the left artery o Coronary arteries - supply nutrients and O2 to the heart from the Aorta Left coronary artery - supplies the left ventricle, interventricular septum, part of the right ventricle, and the conduction system. Has 2 main branches: Anterior descending artery - Circumflex artery Right coronary artery - supplies a portion of the right atrium and right ventricle and part of the conduction system. Has 2 major branches: Posterior descending artery
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Marginal artery Cardiac Physiology Cardiac Cycle o -Systole- part of the cardiac cycle when the heart is contracting , and the semi-lunar valves open o -Diastole - part of the cardiac cycle when the heart is relaxed and cardiac filling and profusion occur. Ejection fraction - each ventricle ejects about 2/3 of the blood it contains Stroke volume - the amount of blood ejected from the ventrical Preload - is the end-diastolic volume and influences the force of the next contraction because of the stretch it exerts (Starling’s Law) Afterload - is the resistance against which the heart muscle ust pump. Cardiac output = Stroke Volume x Heart Rate. o Autonomic Control of the Heart Chronotrophic effect - rate of the heart Inotrophic effect - cardiac contractile force Dromotrophic effect - speed of impulse transmission in the heart. Atrophy - a decrease in cell size due to a decrease in workload. Dysplasia - a change in cell size, shape, or appearance caused by an external stressor. Usually leads to cancer. o Electrolytes - these are electrolytes that effect cardiac function.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ 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