The loss of elasticity of arteries is not lost by diseases like atherosclerosis but also lost under the high blood pressure. As the blood vessels become stiff, the peripheral resistance increases (peripheral resistance is the resistance offered by the blood vessel to the flow of blood) and flexibility of vessel increases due to elastic property of the vessel. Therefore, elasticity is a critical factor to maintain blood vessel diameter.
In the given passage, ventricular contraction is significantly pumps 70mL of blood into ventricular system. Blood pressure is the ration of systolic pressure to diastolic pressure.
In normal arteries, according to the speed and volume of the blood, the diameter of the blood vessel changes accordingly and optimum peripheral resistance is maintained which is essential for proper flow of blood. As the people aging, the elasticity and thickness of blood vessels increases so that, low ability of older people to respond to changes in blood pressure.
Thus, the options (a), (c) and (b) are incorrect.
The loss of elasticity of arteries is not lost by diseases like atherosclerosis but also lost under the high blood pressure. As the blood vessels become stiff, the peripheral resistance increases (peripheral resistance is the resistance offered by the blood vessel to the flow of blood) and flexibility of vessel increases due to elastic property of the vessel. Therefore, elasticity is a critical factor to maintain blood vessel diameter.
Therefore, the correct option is – d. Loss of arterial wall elasticity is always cause dby disease.