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.
The larger the muscles, the heavier the weight: The muscles of the glutes, thighs, chest, and back can usually handle heavier weight than the smaller muscles of the shoulders, arms, abs, and calves. So, for example, you may want to use about 15 or 20 pounds for squats and 10 to 15 pounds for chest presses. You'll usually lift more weight on a machine than with dumbbells: With machines, you're usually using both arms or both legs for the exercises while, with dumbbells, each limb works independently.