1. Chapter 33.2: Blood and Heart Disease

2. 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

3. 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

6. 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

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

9. 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

10. 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