Circulatory System

1. Heart

1.1. Tissues

1.1.1. cardiac

1.1.1.1. heart contraction

1.1.2. smooth

1.1.2.1. protection

1.1.3. nerve

1.1.3.1. signal heart contraction

1.2. Structure

1.2.1. vena cava

1.2.2. atrium

1.2.3. ventricles

1.2.4. pulmonary artery

1.2.5. pulmonary vein

1.2.6. aorta

2. Blood

2.1. Red blood cell (RBC)

2.1.1. Hemoglobin

2.2. White blood cell

2.2.1. immune system

2.3. Platelets

2.3.1. Blood Clotting

2.4. Plasma

2.4.1. Liquids

2.4.2. Proteins

3. Vessels

3.1. Artery

3.1.1. away from the heart

3.2. Vein

3.2.1. towards the heart

3.3. Capillary

3.3.1. one-cell width

3.3.2. diffusion

3.3.3. exchange wastes and nutrients

3.4. Structures

3.4.1. Artery

3.4.1.1. thick

3.4.1.2. elastic

3.4.1.3. No valve

3.4.2. Vein

3.4.2.1. thin

3.4.2.2. valves prevent back flow of blood

4. Diseases

4.1. Atherosclerosis

4.1.1. bypass surgery

4.1.2. lifestyle

4.2. Stroke

4.2.1. clot

4.2.2. not enough oxygen