Final answer:
The main blood components involved with aerobic fitness include red blood cells, which carry oxygen, white blood cells for immune function, platelets for clotting, and plasma containing coagulation factors. Red blood cells are especially important for transporting oxygen which is crucial for sustained aerobic activity.
Step-by-step explanation:
Several components of blood are crucial in the context of aerobic fitness. The primary components of blood include red blood cells, white blood cells, platelets, and plasma. Among these, red blood cells are particularly important for aerobic fitness as they contain hemoglobin, which is responsible for transporting oxygen to the muscles during aerobic activities.
The purpose of red blood cells is to deliver oxygen needed by cells to carry out aerobic respiration, a process that generates the energy required for sustained exercise. White blood cells play a more indirect role by keeping the immune system strong, allowing for consistent training without interruption due to illness. Platelets and coagulation factors in the plasma are essential for wound healing and preventing excessive bleeding, ensuring the body's ability to recover from any injuries incurred during physical activity.