2. FIRST TASK Pick up notetaking guide from tray area. Answer the question at the top of the page.

3. TYPES OF BLOOD VESSELS  1. Arteries  Thick, muscular walls  Carry blood AWAY from the heart to the tissues of the body  1. Arteries  Thick, muscular walls  Carry blood AWAY from the heart to the tissues of the body

4. 2. Capillaries Walls only 1 cell thick which allows materials to diffuse easily - every cell is near a capillary Smallest blood vessels 2. Capillaries Walls only 1 cell thick which allows materials to diffuse easily - every cell is near a capillary Smallest blood vessels

5. 3. Veins –R–Return blood to heart –C–Contain valves to keep blood flowing in one direction –C–Contracting skeletal muscle helps push blood through veins

6. CIRCULATORY DISORDERS  High Blood Pressure  Blood pressure is caused by the force of blood on the walls of the arteries’ walls Systolic Pressure - number when heart contracts Diastolic Pressure - number when heart relaxes Normal: 120/80

7.  High Blood Pressure = Hypertension  Heart must work harder  Increased risk of heart attack and stroke

8.  Artherosclerosis  Fatty deposits called plaque build up on the walls of the arteries  Plaque obstructs the flow of blood  Increased risk of blood clots

9. HH eart Attack CC oronary (heart) arteries become blocked which deprives the heart of oxygen LL ack of oxygen causes the heart muscle to die

10.  Symptoms of Heart Attack  Severe chest pain  Shortness of breath  Nausea  Pain in jaw or arm

11.  Stroke  Lack of blood to the brain  Caused by a clot that blocks an artery leading to the brain or…  Caused by an aneurysm (burst blood vessel)