Lateral view of the human venous system.

Lateral view of the human arterial system.

Lateral view of the human circulatory system in the torso region.

Anterior view of the heart; image is transparent and has the blood flow indicated.

Transection view of heart showing chambers; lower arrow demonstrates blood flowing between cardiac ventricles through opening in the ventricular septum.

Posterior view of the torso region showing the skeletal and circulatory structures.

Image on left shows thorax with intra-aortic balloon catheter introduced via the femoral artery. Center image shows aorta with catheter inflated as in diastole. Image on right shows aorta with catheter deflated as in systole.

Right leg shown from hip to foot encased in pneumatic hose.

Collateral circulation to arm after ligation of the axillary artery. Arrows indicate direction of adjusted blood flow.

Superior view of semilunar valve consisting of three crescent shaped cusps that prevent back flow of blood when opened.

child in supine position with central venous pressure catheter inserted into right atrium. Heart with catheter in place has been made visible.

Superior view of semilunar valve consisting of three crescent shaped cusps that prevent back flow of blood when closed (left).

Heart, blood flow