Question

what do red blood cells do?
produce insulin
regulate blood pressure
carry oxygen to the bodys tissues.
transport nutrients to the bodys tissues
wahelp the liver filter toxins from the blood

Explanation:

Red blood cells contain hemoglobin, which binds to oxygen in the lungs and releases it in the body's tissues. Producing insulin is done by the pancreas. Regulating blood pressure involves multiple systems like the kidneys and blood vessels. Transporting nutrients is mainly by plasma. Helping the liver filter toxins is not a primary red - blood - cell function.

Answer:

Carry oxygen to the body's tissues.