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Questions and Answers
What happens to the sympathetic reflexes in response to a decrease in arterial pressure after hemorrhage?
What happens to the sympathetic reflexes in response to a decrease in arterial pressure after hemorrhage?
- They stimulate the sympathetic vasoconstrictor system (correct)
- They are inhibited
- They stimulate the parasympathetic vasoconstrictor system
- They have no effect on the body's response
What happens to cardiac output and arterial pressure when approximately 10% of the total blood volume is removed?
What happens to cardiac output and arterial pressure when approximately 10% of the total blood volume is removed?
- Arterial pressure decreases but cardiac output remains unchanged
- Arterial pressure increases but cardiac output decreases
- Cardiac output and arterial pressure decrease simultaneously
- There is almost no effect on arterial pressure or cardiac output (correct)
Why does heart activity increase markedly after hemorrhage?
Why does heart activity increase markedly after hemorrhage?
- To increase the cardiac output (correct)
- To decrease total peripheral resistance
- To lower the heart rate
- To constrict the arteries and veins
What allows a person to sustain a 30% to 40% loss of blood volume when the sympathetic reflexes are intact?
What allows a person to sustain a 30% to 40% loss of blood volume when the sympathetic reflexes are intact?
Why is the arterial pressure maintained at or near normal levels in the hemorrhaging person longer than the cardiac output?
Why is the arterial pressure maintained at or near normal levels in the hemorrhaging person longer than the cardiac output?
What is the main effect of sympathetic reflexes on maintaining arterial pressure?
What is the main effect of sympathetic reflexes on maintaining arterial pressure?
What is the role of sympathetic constriction of the veins in maintaining venous return and cardiac output?
What is the role of sympathetic constriction of the veins in maintaining venous return and cardiac output?
What occurs at about 50 mm Hg in the arterial pressure curve of Figure 24-1?
What occurs at about 50 mm Hg in the arterial pressure curve of Figure 24-1?
Which stage of shock is characterized by the normal circulatory compensatory mechanisms causing full recovery without outside therapy?
Which stage of shock is characterized by the normal circulatory compensatory mechanisms causing full recovery without outside therapy?
In which stage of shock does the shock become steadily worse until death occurs?
In which stage of shock does the shock become steadily worse until death occurs?
At what point does all known therapy become inadequate to save a person's life in shock?
At what point does all known therapy become inadequate to save a person's life in shock?
What does hypovolemia mean in the context of circulatory shock?
What does hypovolemia mean in the context of circulatory shock?
Which factor decreases with hemorrhage, leading to a fall in cardiac output and the possibility of shock?
Which factor decreases with hemorrhage, leading to a fall in cardiac output and the possibility of shock?
What is the most common cause of hypovolemic shock?
What is the most common cause of hypovolemic shock?
