Which of the following best describes the primary role of precapillary sphincters in the microcirculation?Group of answer choicesPrecapillary sphincters regulate blood pressure within the arteries.Precapillary sphincters regulate blood flow into capillary beds based on metabolic demands.Precapillary sphincters control the exchange of gases in the capillaries.Precapillary sphincters facilitate the contraction of skeletal muscles during exercise. Previous
Question
Which of the following best describes the primary role of precapillary sphincters in the microcirculation?Group of answer choicesPrecapillary sphincters regulate blood pressure within the arteries.Precapillary sphincters regulate blood flow into capillary beds based on metabolic demands.Precapillary sphincters control the exchange of gases in the capillaries.Precapillary sphincters facilitate the contraction of skeletal muscles during exercise. Previous
Solution
The primary role of precapillary sphincters in the microcirculation is to regulate blood flow into capillary beds based on metabolic demands. These sphincters are rings of smooth muscle that contract and relax to control the amount of blood that flows into the capillaries from arterioles. When the body's tissues need more oxygen and nutrients, such as during exercise, the sphincters relax to allow more blood to flow into the capillaries. When the metabolic demands are low, the sphincters contract to reduce blood flow. This mechanism ensures that the tissues receive the right amount of blood based on their needs.
Similar Questions
What is the function of precapillary sphincters?Multiple choice question.They control blood flow into the capillary network.They provide a lipid transport mechanism.They allow large molecules and cells to exit the network.They absorb carbon dioxide from the tissues.
What controls the relaxation and contraction of the precapillary sphincters?Multiple choice question.the force of contraction of the ventriclesthe innervation of the surrounding skeletal musclesthe pressure of the colloid osmotic component of capillary exchangethe availability of oxygen and nutrients to the tissues surrounding the capillary network
Blood flow through capillaries is regulated byMultiple Choiceone-way valves in the veins.precapillary sphincters.elastic valves.skeletal muscle contraction.the tunica intima.
What controls blood flow into the capillary network?Multiple choice question.tunica mediaplaque formationlumen resistanceprecapillary sphincters
As oxygen levels in a tissue decrease, the precapillary sphincters contract.True false question.TrueFalse
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