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.
Cramping Day Before Menstruation or After Period Delay. Sharp spastic cramps after sex, occurring during your period delay and accompanied by heavy bleeding, dizziness, and sometimes loss of consciousness, may be the sign of an ectopic pregnancy or self-abortion, the termination of healthy pregnancy.