One of the great mysteries of maple syrup is what causes the sap to flow out of the trees. . Following is an explanation of how temperature fluctuations and pressure and suction in the tree cause sap to flow.Early in the spring, when the maple trees are still dormant, temperatures rise above freezing during the day but drop back below freezing at night.ollowing is an explanation of how temperature fluctuations and pressure and suction in the tree cause sap to flow. Early in the spring, when the maple trees are still dormant, temperatures rise above freezing during the day but drop back below freezing at night.
Some men have low levels of testosterone. This is called hypogonadism, or low-T. A man's testosterone level normally decreases with age. About 4 out of 10 men over the age of 45 have low testosterone. It is seen in about 2 out of 10 men over 60, 3 out of 10 men over 70, and 3 out of 10 men over 80 years old. Share.
In young adult men, only about 2%. of testosterone is in the free form, 30% is bound tightly to. SHBG, and 68% is weakly bound to albumin (5). Although a testosterone determination is the threshold. test in the evaluation of suspected male hypogonadism, the. total testosterone concentration may be within the normal.