Definition

1. Noun:
   • Blood found in veins: Venous blood is the blood that is present within the veins of the circulatory system.
   • Deoxygenated blood: With the exception of the pulmonary vein, venous blood is characteristically rich in carbon dioxide and poor in oxygen, having delivered oxygen to tissues.

Usage

• Venous blood is typically drawn for many common medical tests.
• The color of venous blood is a darker red compared to arterial blood due to its lower oxygen content.

Examples

• The nurse collected a sample of venous blood from the patient's arm.
• Venous blood returns to the heart through the venae cavae.
• The analysis showed a high level of carbon dioxide in the venous blood.

Advanced Usage

• Venous blood gas (VBG): A test that measures the acidity (pH) and the levels of oxygen and carbon dioxide in venous blood, often used as an alternative to an arterial blood gas test in certain clinical assessments.

Variants and Related Words

• Venous (adjective): Relating to or contained within a vein or veins.
  • The venous system carries blood back to the heart.
• Venule (noun): A very small vein.
• Phlebotomy (noun): The process of making an incision in a vein to draw blood; the drawing of venous blood.

Synonyms

• Deoxygenated blood (in systemic circulation)
• Dark blood (descriptive, non-technical)

Antonyms

• Arterial blood
• Oxygenated blood

Related Phrases

• Venous return: The flow of blood back to the heart via the veins.
• Venous insufficiency: A condition where veins have problems sending blood from the limbs back to the heart.

Noun

1. blood found in the veins
   • except in the pulmonary vein venous blood is rich in carbon dioxide and poor in oxygen