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alveolus

tiny, thin-walled structure across which oxygen gas is absorbed and carbon dioxide is released in the lungs

artery

large blood vessel that carries blood away from the heart

atrium

small chamber in the human heart that receives blood from the veins

capillary

tiny blood vessel that transports blood between larger blood vessels and other tissues in the body

circulatory system

boyd system that transports nutrients and wastes between various body tissues; included heart, blood, and blood vessels

hemoglobin

iron-rich protein in red blood cells that allows the cell to absorb oxygen gas

lymph

collection of interstitial fluid and white blood cells that flows through the lymphatic system

lymphatic system

body system that consist of organs, vessels, and nodes through which the lymph circulates

lymphocyte

white blood cell that plays a role in an immune response; see B cell and T cell

node

organ located along the lymphatic vessels that filters bacteria and foreign particles from lymph

plasma

clear, yellowish fluid, about 90 percent water, that suspends cells in the blood

platelet

cell fragment that is produced in the bone marrow and is important for blood clotting

red blood cell

cell that carries oxygen gas from the lungs to the rest of the body

respiratory system

body system that brings oxygen into the body and removes carbon dioxide; includes the nose, trachea, and lungs

vein

large blood vessel that carries blood from the rest of the body to the heart

ventricle

large chamber in the heart that receives blood from an atrium an dumps blood to the rest of the body

white blood cell

cell that attacks pathogens

pulmonary circuit

collection of blood vessels that carries blood between the lungs and the heart

systemic circuit

collection of blood vessels that carries blood between the heart and the rest of the body,
except for the lungs