Intrinsic Regulation by Endothelial Factors Quiz

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What is the primary response of vascular smooth muscle when systemic arterial pressure increases?

Vasodilation

Vasoconstriction (correct)

Vasospasm

Platelet adhesion

Which of the following is an intrinsic regulator of blood flow by endothelial factors?

Angiotensin II

ADH

Prostacyclin (correct)

Nitric Oxide

What happens if endothelial cells are damaged?

Prostacyclin increases

Vasoconstriction reduces

Nitric Oxide decreases (correct)

Endothelin decreases

How does cold application affect blood flow?

Vasoconstriction Signup and view all the answers

Which factor is NOT involved in neural and hormonal regulation of blood flow?

Prostacyclin Signup and view all the answers

What is the main effect of heat application on blood flow?

Vasodilation Signup and view all the answers

What is the term for the accumulation of blood in response to blocked veins, leading to a transient increase in blood flow upon removal of the blockage?

Reactive hyperemia Signup and view all the answers

Which specialized mechanism is responsible for neuron-dependent hemodynamic response in the brain and release of NO in penile tissue during hyperemia?

Endothelial factors Signup and view all the answers

What condition is characterized by vasospasms caused by cold temperatures or strong emotions, leading to discoloration, ischemia, and necrosis of tissue in fingers, toes, ears, and nose?

Raynaud's phenomenon Signup and view all the answers

Intrinsic regulation to maintain relatively constant blood flow through tissues over a wide range of systemic arterial pressures is primarily carried out by which mechanism?

Myogenic regulation Signup and view all the answers

Which type of hyperemia occurs during exercise and results in an increased blood flow to tissue in response to heightened tissue metabolism?

Active hyperemia Signup and view all the answers

What is the term for the condition where increased blood flow removes waste products and cell debris after a decrease in blood flow due to vasospasms?

Reactive hyperemia Signup and view all the answers

What is the primary reason for regulating blood flow according to the text?

To ensure tissues receive enough blood for their current metabolic activity level Signup and view all the answers

What is the function of a precapillary sphincter in the capillary bed?

To regulate the flow of blood into the capillary bed Signup and view all the answers

Which mechanism allows organs to autoregulate their own blood flow rates?

Intrinsic regulation by local action on vascular smooth muscle Signup and view all the answers

What allows each tissue to control its own local blood flow in proportion to its metabolic needs?

Intrinsic receptors sensing chemical changes in the environment Signup and view all the answers

How can blood flow be regulated by actions of the sympathetic nervous system?

Vasoconstriction or vasodilation through direct action on vascular smooth muscle Signup and view all the answers

What effect can vasodilation of metarterioles and relaxation of precapillary sphincters have on blood flow?

Increase blood flow significantly Signup and view all the answers