are attached to portable ladders, which are used. on each side of a ladder jack scaffold to form a. means of support for a platform.
Vena cava: The superior vena cava is the large vein which returns blood to the heart from the head, neck and both upper limbs.The inferior vena cava returns blood to the heart from the lower part of the body.The return of blood via the vena cava can be compromised and cause disease.For example, in the superior vena cava syndrome, the symptoms that result from compression of the large vein that carries blood down to the heart.The superior vena cava is located in the middle of the chest and is surrounded by rigid structures and lymph nodes.he return of blood via the vena cava can be compromised and cause disease. For example, in the superior vena cava syndrome, the symptoms that result from compression of the large vein that carries blood down to the heart.
Systemic circulation is the part of the cardiovascular system which carries oxygenated blood away from the heart to the body, and returns deoxygenated blood back to the heart.ulmonary Circulation. The circulation of the blood through the lungs. Pulmonary Veins. The veins that return the oxygenated blood from the lungs to the left atrium of the heart. Superior Vena Cava. The large vein that carries blood from the head, neck, arms, and chest to the heart.