Heart and Respiratory Flashcards
Heart
muscle with 3 layers -pericardium -myocardium -endocardium pumps blood
Four Chambers
right atrium
right ventricle
left atrium
left ventricle
Systole
ventricles contract
Diastole
Relaxation phase
Arteries
carry oxygenated blood away from heart
largest = Aorta
Veins
carry deoxygenated blood back to heart
largest = Vena Cava
Capillaries
arteries meet veins
exchange of oxygen & nutrients takes place
Red blood cells
erythrocytes
carry oxygen
iron (hemoglobin) gives red color
White blood cells
leukocytes
protect from infection
Platelets
thrombocytes
cause blood to clot
Plasma
liquid portion of blood
55% of blood
Changes in circulatory system due to aging
heart pumps less efficiently
blood vessels narrow
vessels less elastic
blood flow decreases
Hypertension
hardening & narrowing of blood vessels treatment- medication exercise low fat/sodium diet
Coronary Artery Disease
build up of plaque in arteries of heart
Myocardial Ischemia
blood supply to heart muscle reduced