Blood

Circulating connective tissue delivering oxygen, nutrients, and signaling molecules to every organ, including one-fifth of cardiac output to the brain.

Core Characteristics

• Composed of plasma, erythrocytes, leukocytes, and platelets.
• The blood-brain barrier tightly gates its exchange with neural tissue.
• Transports hormones between endocrine glands and their targets.

Related Concepts & Sources

Lymphocyte, Body Systems, Hormone Registry