CIE IGCSE Biology: 复习笔记：9.1.11 Circulation Around the Body

• Blood is carried away from the heart and towards organs in arteries
• These narrow to arterioles and then capillaries as they pass through the organ
• The capillaries widen to venules and finally veins as they move away from the organs
• Veins carry blood back toward the heart

The circulatory system

Important Blood Vessels Table

转载自savemyexams