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How does smooth muscle make blood vessels function?
Smooth muscle is mostly in the afferent branch going from the arteries to the arterioles. The body controls where blood will flow by controlling the vessel diameter. An increase in sympathetic tone constricts smooth muscle, decreases blood vessel diameter, and limits blood flow.
Which would have the greater effect on vascular resistance?
Vasoconstriction would have a greater effect on increasing vascular resistance compared to vasodilation. When blood vessels constrict, their diameter decreases, leading to increased resistance to blood flow. Conversely, vasodilation results in an expansion of blood vessel diameter, reducing resistance.
What effect does local heat application have on blood vessel diameter?
Vasodilation or enlargement of the blood vessel
Explain relationship between the diameter of vessels and the velocity of blood?
As vessel diameter decreases, blood velocity increases due to the principle of conservation of flow rate. This relationship is described by Poiseuille's law, which states that blood flow is directly proportional to the fourth power of vessel radius. Therefore, smaller vessels result in faster blood flow velocities.
What is Vasolidation?
increase in the diameter of blood vessel. it increases the blood flow
A decrease in the diameter of a blood vessel is termed?
vasoconstriction.
How does lactic acid affect blood vessel size?
It decreases the size.
Which blood vessel tunic is composed of smooth muscle and controls the diameter of the vessel?
Tunica interna
Would doubling the length of a blood vessel have the greater effect on vascular resistance?
In which of the following would the blood flow be highest? A) a vessel 0.5 cm in diameter and 4 meters long B) a vessel 1.0 cm in diameter and 10 meters long C) a vessel 0.5 cm in diameter and 2 meters long D) a vessel 1.0 cm in diameter and 2 meters long
What is the increase of diameter in a blood vessel called?
Vasodilation: Widening of blood vessels resulting from relaxation of the muscular wall of the vessels. What widens is actually the diameter of the interior (the lumen) of the vessel. The opposite of vasoconstriction.
Hoe does SVR affect blood pressure?
The resistance offered by the peripheral circulation is known as the systemic vascular resistance (SVR). Vasoconstriction (i.e., decrease in blood vessel diameter) increases SVR, whereas vasodilation (increase in diameter) decreases SVR. this constriction and dialation decreases or increases the volume in which the vessles can potensially hold. the blood pressure is subsequantly altered as more or less vascular space is provided.
Which of the following is NOT an important source of resistance to blood flow?
An important source of resistance to blood flow is not low blood viscosity, as low viscosity would actually decrease resistance. The important sources of resistance to blood flow are vessel diameter, vessel length, and blood viscosity.
