The main function of the nervous system is to coordinate body activities by transmitting signals between different parts of the body.

The main role of the digestive system is to break down food into smaller molecules that can be absorbed into the bloodstream.

The primary function of the circulatory system is to transport nutrients and oxygen to cells and remove waste products.

The primary function of the respiratory system is to exchange gases, specifically oxygen and carbon dioxide, between the body and the environment.

The primary role of red blood cells is to transport oxygen from the lungs to the body's tissues and return carbon dioxide to the lungs.

Insulin is the hormone primarily responsible for regulating blood sugar levels by facilitating the uptake of glucose into cells.

The kidneys are primarily responsible for filtering blood, removing waste products and excess substances to form urine.

Mitochondria are known as the powerhouse of the cell and are responsible for energy production through cellular respiration.

Respiration is the process that describes the breakdown of glucose to produce energy, primarily in the form of ATP.

Osmosis is the process that involves the movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.