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.
Side effects vs STI: Some women notice that their periods are off in timing +/- 2 days after taking Plan B. It is often the next month's period that is heavier or longer, not the current one. In your case, I suspect you had unprotected sex (hence the need for Plan B) and may be experiencing pain from a pelvic infection/ STI. You need to see a physician for STI testing and treatment. ...Read more.