Lung
A Primary Organ Of The Respiratory System Where Gas Exchange Occurs.

Respiratory System
An Organ System Responsible For Gas Exchange, Supplying Oxygen And Removing Carbon Dioxide.

Hemoglobin
A Protein In Red Blood Cells That Binds Oxygen.

Red Blood Cell
A Cell That Carries Oxygen Using Hemoglobin In The Circulatory System.

Blood Plasma
The Liquid Component Of Blood That Transports Nutrients, Hormones, And Waste Products.

Capillary
A Tiny Blood Vessel Where Exchange Of Gases And Nutrients Occurs Between Blood And Cells.

Vein
A Blood Vessel That Carries Blood Toward The Heart.

Artery
A Blood Vessel That Carries Blood Away From The Heart.

Heart
A Muscular Organ In The Circulatory System That Pumps Blood Throughout The Body.

Circulatory System
An Organ System That Transports Nutrients, Gases, And Wastes Through Blood Vessels.