The cardiovascular system

Arteries

Largest blood vessel that take oxygenated blood away from the heart

Arterioles

Smaller than arteries but do the same thing

Veins

Take blood to the heart

Veinules

Smaller than veins but do the same thing

Layers of a blood vessel

T. Intima: reduces friction

T. Media : muscles allow for constricting

T. Externa: protection

Circulatory shock

Hypotension caused by heart attack probably

Arteriosclerosis

Build up of plaque in the arteries treatments: angioplasty, stent, bypass surgery

Functions of blood

1. Transport stuff
2. Fight off infection (WBC)
3. Maintain body ph
4. Remove waste

55% of blood

Plasma (made up of water, nutrients, hormones and proteins)

44% of blood

Red blood cells (erythrocytes)

1% of blood

WBC and platelets

Hemoglobin

Protein responsible for binding the oxygen to red blood cells (contains iron)