Tag: biology

Blood pressure is measured in 2 categories, systolic blood pressure and diastolic blood pressure. The systolic pressure is the amount of pressure in the arteries during the contraction of the heart muscle. The diastolic pressure is the pressure during the resting period between heartbeats. The normal value of systolic pressure in human is 120 mm of Hg. The normal value of diastolic pressure in human is 80 mm of Hg.

Blood pressure is the pressure of the circulating blood against the walls of the arteries, the veins, and the chambers of the heart. The blood pressure in the large artery of the heart, the aorta, and the other large arteries of a healthy adult is usually 120 mm Hg during the contraction of the heart (systole), and 80 mm Hg during relaxation of the heart (diastole). Normal blood pressure is less than 120/80 mm Hg. So, the correct answer is-120/80 mm Hg.

• Vasopressin regulates the tonicity of body fluids. It is released from the posterior pituitary in response to hypertonicity and causes the kidneys to reabsorb solute-free water and return it to the circulation from the tubules of the nephron, thus returning the tonicity of the body fluids toward normal.
  
• If vasopressin receptors are absent, it would result in increased loss of water from the body, leading to dehydration, increased thirst and Increased blood pressure.

High blood pressure can cause serious medical problems. Reacting to stress in high blood pressure can increase the risk of heart attacks and strokes due to the increase of blood flow in blood vessels. So, to avoid stress is one of the precautions for the persons having high blood pressure.