Answer :
the greatest effect on peripheral resistance is usually on (A) blood vessel diameter
The diameter of blood vessels has the greatest effect on peripheral resistance. Peripheral resistance refers to the resistance encountered by the blood flow as it travels through the smaller blood vessels, such as arterioles and capillaries.
The diameter of these blood vessels can be adjusted through a process called vasoconstriction or vasodilation, which affects the resistance to blood flow. When blood vessel diameter decreases (vasoconstriction), the resistance to blood flow increases, leading to higher peripheral resistance.
Conversely, when blood vessel diameter increases (vasodilation), the resistance to blood flow decreases, resulting in lower peripheral resistance.
Therefore peripheral resistance is thought to be primarily influenced by blood vessel diameter, although blood vessel length and viscosity also play a role.
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