Yes, 65-70% of the blood volume is in the venous system.
The venous system is responsible for returning deoxygenated blood from the tissues back to the heart. It transports this blood through a network of veins, which have valves to prevent the backflow of blood. The venous system also plays a role in regulating blood volume and pressure in the body.
brachiocephalic
subclavian vein
lymphatic system
Very simply put the venous system, the arterial system and your heart. The venous system bring blood from your organs and extremities to your heart, which pumps it and the arterial system takes it from your heart to your organs and extremities.
blood vessel bloodstream heart liver lymph lymph gland lymph node vein vena venation venous blood system venous blood vessel
testicular vein and artery
Contraction of veins would increase venous return to the right atrium. It would increase the efficiency of the heart pumping.
The thoracic duct joins the venous system at the junction of the left subclavian vein and the internal jugular vein, near the base of the neck.
The largest vessels in the venous system are the superior and inferior vena cava. They are responsible for carrying deoxygenated blood from the body to the heart.
Coronary sinus