What are the four components of blood?

Plasma - 55% Red Blood Cells - 44% White Blood Cells & Platelets - 1%

Red Blood Cells are specialized for?

Oxygen transport, contains hemoglobin (no nucleus)

White blood cells are specialized for?

Protecting the body from infection (has nucleus)

What are Platelets?

Fragments of cells that form when larger cells in the bone marrow break apart

What do Platelets play a role in?

Blood Clotting

When does vasodilation occur?

When the body is too warm

When does vasoconstriction occur?

When the body is too cold