Q1. Define "Biological Rhythms" and explain the two infradian rhythms.
             Biological rhythms are defined as a periodic, more or less regular, fluctuation in a biological system that may or may not have psychological implications. Infradian rhythms are a certain type of biological rhythm that is a occurring less frequently than once a day, such as birds migrating, Seasonal Affective Disorder, and the menstrual cycle.
             Seasonal Affective Disorder (SAD) is an infradian rhythm that affects many people. It is characterized by certain symptoms, including depression, constant drowsiness, constant hunger, carbohydrate cravings, and a frequent feeling of being lethargic. Though there are numerous sufferers of this disorder, there is no instant cure. One treatment for the disorder is a special kind of light treatment where the person suffering from SAD uses a special light that is more like natural sunlight as opposed to an indoor light.
             Another infradian rhythm is the Menstrual Cycle in women. The entire menstrual cycle is a complex cause and effect series. During the first half of the cycle, there is an increase in the woman's estrogen levels, which causes the uterus to thicken. Around mid-cycle, ovulation occurs which in turn causes a progesterone increase that helps the uterine lining to receive the egg. If conception doesn't occur, the estrogen and progesterone levels return to normal, and the uterine lining sloughs off as the menstrual flow.
             PMS (Pre-menstrual Syndrome) is also an infradian rhythm. Some causes of PMS are a progesterone deficiency, levels of progesterone and estrogen are imbalanced, the level of sodium in the body increases, and there is a drop in the level of endorphins. The symptoms of PMS differ from woman to woman, but can include abdominal cramping, irritability, body aches, and acne breakouts.
             Q2. Define "Circadian Rhythms" and explain the rhythms of sleep.
             A Circadian Rh...