Fig. 20-13. Sequence of impulse conduction through the heart.
Fig. 20-4b. Direction of ventricular fibers twists the heart during contraction.
Fig. 20-8 a & b. The fibrous
skeleton of the heart anchors the
valves and electrically
separates the atria and
ventricles.
Fig. 20-8. Layers of the heart wall.
Fig. 21-1. Layers of the walls of blood vessels.
Fig. 21-2. Elastic and muscular arteries
Fig. 21-5. Arterioles and capillary bed
Fig. 21-2. Venules and veins
Fig. 21-4. Continuous and fenestrated capillaries
Fig. 21-6. Valves in the veins
promote blood flow back to the heart.