Does the stimulation of adrenal medulla increase or decrease blood pressure?
The adrenal medulla is a small, triangular organ located on top of each kidney. It is part of the endocrine system and is responsible for producing hormones such as adrenaline (epinephrine) and noradrenaline (norepinephrine). These hormones are released into the bloodstream when the body is under stress, and they cause a number of changes to occur, including an increase in blood pressure.
The increase in blood pressure is caused by the vasoconstriction of blood vessels. This means that the blood vessels become narrower, which increases the resistance to blood flow and therefore increases the blood pressure. The vasoconstriction is caused by the activation of alpha-adrenergic receptors on the smooth muscle cells of the blood vessels.
The increase in blood pressure is a normal response to stress and helps to ensure that the body has enough blood flow to meet its increased needs. However, if the blood pressure remains elevated for a prolonged period of time, it can damage the blood vessels and lead to health problems such as heart disease and stroke.