Vasomotor Control

Question 1

What are chemoreceptors responsible for detecting?

Answer 1

• Increased O₂ levels
• Decreased lactic acid levels
• Increased CO₂ levels
• Increased lactic acid levels

Chemoreceptors play a crucial role in monitoring chemical changes in the blood.

Question 2

What do baroreceptors respond to?

Answer 2

• Decreased stretch on vessel walls
• Increased stretch on vessel walls

Baroreceptors are sensitive to changes in blood pressure.

Question 3

What is the vasomotor control centre (VCC) responsible for?

Answer 3

Cardiac output distribution

The VCC is located in the medulla oblongata.

Question 4

Define vasomotor tone.

Answer 4

The partial state of smooth muscle constriction in arterial walls

This tone is crucial for regulating blood flow.

Question 5

The vascular shunt mechanism is controlled by which part of the brain?

Answer 5

Vasomotor control centre (VCC) in the medulla oblongata

It regulates blood flow by altering the stimulation of arterioles and pre-capillary sphincters.

Question 6

What happens to sympathetic stimulation during exercise?

Answer 6

• Increases to vasoconstrict arterioles and pre-capillary sphincters
• Decreases to vasodilate arterioles and pre-capillary sphincters

This adjustment helps manage blood flow to active muscles.

Question 7

True or false: Sympathetic stimulation decreases blood flow to muscle cells during exercise.

Answer 7

FALSE

Sympathetic stimulation increases to direct more blood flow to active muscles.

Question 8

Fill in the blank: The VCC receives information from chemoreceptors regarding _______ changes.

Answer 8

chemical

This includes changes in CO₂ and lactic acid levels.

Question 9

What is the effect of increased sympathetic stimulation on arterioles?

Answer 9

Vasoconstriction

This limits blood flow to certain areas, such as muscles at rest.

Question 10

What does VCC stand for in the context of the cardiovascular system?

Answer 10

Vasomotor Control Centre

The VCC is located in the medulla oblongata.

Question 11

Where is the Vasomotor Control Centre located?

Answer 11

In the medulla oblongata

It plays a crucial role in regulating blood flow.

Question 12

What is the role of the Vasomotor Control Centre?

Answer 12

Distribution of cardiac output

It regulates blood flow to different parts of the body.

Question 13

At rest, the arterioles and pre-capillary sphincters are stimulated to ________.

Answer 13

vasoconstrict

This limits blood flow to the muscle cells.

Question 14

During exercise, the arterioles and pre-capillary sphincters ________.

Answer 14

vasodilate

This increases blood flow to the muscle cells.

Question 15

At maximal intensities, up to ________ percent of cardiac output is redistributed to the working muscles.

Answer 15

88

This highlights the body’s ability to prioritize blood flow during intense physical activity.