MCQ_MINI3 Local Control Of Blood Flow

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| By Chachelly

Chachelly

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1/7 Questions

During vigorous exercise, skeletal muscle blood flow increases greatly. What is the circulatory adjustment most responsible for this change?
- Increased beta-adrenergic receptor stimulation in skeletal muscle blood vessels.
- Increased local vasodilation in skeletal muscles.
- Increased cardiac stroke volume.
- Increased cardiac parasympathetic stimulation.

Cardiovascular Physiology Quizzes & Trivia

About This Quiz

This quiz focuses on the local control of blood flow, particularly in skeletal muscles, and includes mechanisms like adenosine levels and nitric oxide production. It assesses understanding of physiological responses during exercise and pharmacological impacts on the cardiovascular system.

2.

Which of the following will REDUCE vascular smooth muscle tone (resting tension)?
- Stimulating nitric oxide (NO) production
- Stimulating the intrinsic myogenic mechanism of blood vessels
- Stimulating alpha-1 receptors
- Stimulating beta-2 receptors
Correct Answer

A. Stimulating nitric oxide (NO) production

Explanation

Stimulating nitric oxide (NO) production will reduce vascular smooth muscle tone (resting tension). Nitric oxide is a potent vasodilator that relaxes the smooth muscle in blood vessels, leading to vasodilation and a decrease in vascular tone. This allows for increased blood flow and decreased resistance in the blood vessels.

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3.

What happens to local vascular resistance following an increase in adenosine levels in the interstitial fluid surrounding the arterioles in skeletal muscle?
- Does not change
- Decreases
- Increases
Correct Answer

A. Decreases

Explanation

RESISTANCE and Diameter are inversely related

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4.

If you occlude blood flow to a skeletal muscle for 1 minute, what changes will occur immediately following the removaI of the occlusion?
- A 15-30 second period during which flow slowly increases to the normal value
- A 15-30 second period during which flow is markedly higher than prior to occlusion
- A rapid (less than 2 seconds) return to normal flow
Correct Answer

A. A 15-30 second period during which flow is markedly higher than prior to occlusion

Explanation

This is reactive Hyperemia

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5.

While jogging on a treadmill, predict how the increase in activity will affect the tone of the arterioles in the active skeletal muscles and the volume of blood flow through the active skeletal muscles (as compared to rest). tone of the arterioles in the active skeletal muscles volume of blood flow through the active skeletal muscles
- increase increase
- increase decrease
- decrease decrease
- decrease increase
- no change increase
- no change decrease
Correct Answer

A. decrease increase

Explanation

capillaries have no change in tone, ARTRIOLES do

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6.

Local control of the circulation prevails over neural control in which of the following organs?
- Brain
- Skin
- GI tract
- Skeletal muscle
Correct Answer

A. Brain

Explanation

also kidney

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7.

A hypothetical drug given intravenously caused a decrease in mean arterial pressure and at the same time a decrease in heart rate. Which of the following could explain the actions of this drug?
- Beta-1 and Beta-2 receptor agonist
- Alpha-1 receptor agonist
- Inhibitor of parasympathetic effects in heart muscle
- Stimulator of histamine release
- Beta-l and Alpha-l antagonist
Correct Answer

A. Beta-l and Alpha-l antagonist

Explanation

The drug is likely a Beta-1 and Alpha-1 antagonist, as it causes a decrease in both mean arterial pressure and heart rate. By blocking the Beta-1 receptors, the drug reduces the heart's contractility and therefore decreases heart rate. By blocking the Alpha-1 receptors, the drug causes vasodilation, which leads to a decrease in mean arterial pressure.

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Current Version
Mar 22, 2023

Quiz Edited by
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Nov 10, 2011

Quiz Created by
Chachelly

Mcq_mini3 Local Control Of Blood Flow

During vigorous exercise, skeletal muscle blood flow increases greatly. What is the circulatory adjustment most responsible for this change?

Quiz Preview

Which of the following will REDUCE vascular smooth muscle tone (resting tension)?

What happens to local vascular resistance following an increase in adenosine levels in the interstitial fluid surrounding the arterioles in skeletal muscle?

If you occlude blood flow to a skeletal muscle for 1 minute, what changes will occur immediately following the removaI of the occlusion?

Local control of the circulation prevails over neural control in which of the following organs?

A hypothetical drug given intravenously caused a decrease in mean arterial pressure and at the same time a decrease in heart rate. Which of the following could explain the actions of this drug?