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.
Abdominal Cramps. Some women experience cramps early in pregnancy. This is usually due to the fertilized egg, or embryo, implanting into the uterus. Implantation occurs 8 to 10 days after ovulation, which is 4 to 6 days before a missed period would occur.ut some women experience pregnancy symptoms days before their period is due. As a result of the shift in hormones, tiny changes take place in the body that alert the woman that she may be pregnant even before a positive pregnancy test.