Final answer:
The symptoms of nephritic syndrome are caused by the loss of protein in the blood.
Step-by-step explanation:
The statement All the symptoms of nephritic syndrome are caused by the loss of protein in the blood is true. Nephritic syndrome is characterized by the glomerulus getting damaged, leading to the loss of protein in the blood. This proteinuria results in symptoms such as swelling, low serum albumin, and high cholesterol. The leaking of protein into the urine is a key feature of nephritic syndrome.