The average life of a human red blood cell (erythrocyte) is 120 days. In humans, erythrocytes (red blood cells or RBCs) are functional on average 120 days.8 people found this useful. normal healthy white blood cell lives for approximately 12 hours. Whereas a healthy red blood cell lives for about 90 days. Although blood is produced from healthy bone marr â¦ ow and constantly producing new red and white blood cells.
The main muscle targeted by the dumbbell shoulder press is the anterior deltoid, or the front shoulder. To a slightly lesser degree, the exercise also hits the remaining deltoid muscles, including the lateral deltoid, or the outside of your shoulder, and posterior deltoid, or the back of your shoulder.
As its name implies, the shoulder press targets the shoulders, specifically the deltoids. However, this classic exercise doesn't limit itself to one muscle group; it engages numerous secondary muscles as synergists and stabilizers.he rising motion of the shoulder press also contracts the middle and lower trapezius, using the upper traps to help stabilize the motion. Shoulder presses also work the rotator cuff and the small supraspinatus muscle of the shoulder blade as secondary muscles.