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.
The systemic circulation is a major portion of the circulatory system. The network of veins, arteries and blood vessels transports oxygenated blood from the heart, delivers oxygen and nutrients to the body's cells and then returns deoxygenated blood back to the heart.The system of blood vessels in the human body measure about 60,000 miles (96,560 kilometers).Arteries carry oxygen-rich blood from the heart through the body. Veins carry oxygen-poor blood back to the heart. The superior vena cava carries oxygen-poor blood into the heart.The aorta carries oxygenated blood from the heart to organs and tissues. Related 1  : Circulatory System: Facts, Function & Diseases.he system of blood vessels in the human body measure about 60,000 miles (96,560 kilometers). Arteries carry oxygen-rich blood from the heart through the body. Veins carry oxygen-poor blood back to the heart. The superior vena cava carries oxygen-poor blood into the heart.