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.
Morning sickness is one of the best-known (and most obvious!) symptoms of pregnancy. âMorning sickness often starts from 6 weeks - around two weeks after you miss your period, explains GP Dr Philippa Kaye. But some women can feel nauseous as early as 2-3 weeks, and for many it's one of the first symptoms of their pregnancy. Of course, no two women are the same and neither are any two pregnancies.