What areas of the body do blood vessels drain?

Blood vessels drain the entire body, including:

- Head and neck: Blood vessels drain the scalp, face, and neck into the jugular veins, which carry blood back to the heart.

- Upper limbs: Blood vessels drain the arms and hands into the axillary veins and subclavian veins, which carry blood back to the heart.

- Thorax: Blood vessels drain the heart, lungs, and chest wall into the superior vena cava, which carries blood back to the heart.

- Abdomen: Blood vessels drain the stomach, intestines, liver, spleen, and other abdominal organs into the hepatic portal vein, which carries blood to the liver, and the inferior vena cava, which carries blood back to the heart.

- Pelvis: Blood vessels drain the pelvic organs, including the urinary bladder, rectum, and reproductive organs, into the internal iliac veins and external iliac veins, which carry blood back to the heart.

- Lower limbs: Blood vessels drain the legs and feet into the femoral veins and popliteal veins, which carry blood back to the heart.