Final answer:
The choice between venous or arterial measurements for indicating disease severity depends on the condition being evaluated. Arterial blood is commonly used for respiratory function assessment, while venous blood offers insight into metabolic and renal status. Both types of measurements have distinct clinical importance based on the disease in question.
Step-by-step explanation:
Measuring venous or arterial are better at indicating the severity of disease depends on the specific condition being assessed. For example, arterial blood is typically used to evaluate gases like oxygen and carbon dioxide, indicating respiratory function and is therefore used in conditions such as chronic obstructive pulmonary disease (COPD) and other pulmonary disorders. On the other hand, venous blood can provide information on metabolic status, hydration, and renal function and is often used to monitor these conditions.
Restriction of the nervi vasorum to the outer layers of arteries can make arterial diseases more prevalent as it is more challenging to nourish arterial cells and remove waste, which could contribute to the severity of arterial diseases compared to venous diseases. However, both venous and arterial measurements can provide valuable information regarding different aspects of a person's health and the severity of disease.
It is incorrect to say that blood in the pulmonary vein is deoxygenated; in fact, it is oxygenated. Blood in the inferior vena cava and the pulmonary artery is deoxygenated, while blood in the aorta is oxygenated. This understanding is critical in interpreting blood tests and diagnosing conditions.