1.Red blood cells carry nutrition and oxygen through the capillaries to the tissues. 2. Oxygen is inhaled from the atmosphere to alveoli. 3. Oxygen diffuses into the pulmonary capillaries carried by hemoglobin through the systemic capillaries to the cells. 4. Hemoglobin gives up oxygen and picks up carbon dioxide by diffusion.
Pre-menstrual symptoms (PMS) are the symptoms that a woman may experience one or two weeks before her period begins. PMS is more common in women of age group 30 to 40. About 80% of women experience mild or severe premenstrual symptoms before each period.
PMS affects girls a little bit before their period starts and gets better when they actually have their period, while period cramps usually start as soon as girls get their period. Period cramps normally start right before you get your period and are at their worst about a day after you first start feeling sore.