Chapter 33.2: Blood and Heart Disease

Blood Contains plasma Contains red blood cells 90% water 10% dissolved gases, salts, nutrients, enzymes, hormones and waste Contains red blood cells Also called erythrocytes Carry oxygen with the protein hemoglobin

Blood Contains white blood cells Contains platelets Also called leukocytes Fight off infections, toxins, and parasites Contains platelets Are cell fragments Use plasma proteins to enable blood clotting

Circulatory System Diseases High Blood Pressure Also called hypertension About 140/90 Heart Disease Atherosclerosis Fat creates deposits called plaques in arteries Can cause a heart attack Blocked arteries disrupt blood flow to the heart

Circulatory System Diseases Stroke Occurs when the blood supply to part of the brain is disrupted, and brain cells die

Decreasing the Risk of Circulatory Disease Cholesterol Is a lipid and is in many fatty foods Can collect into plaques on the sides of arteries Reducing the amount of cholesterol in your diet reduces circulatory disease

Decreasing the Risk of Circulatory Disease Exercise Uses up calories and reduces obesity Every pound of fat has 3 to 7 miles of blood vessels, which strain the heart