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Questions and Answers
What is the definition of shock in medical terms?
What is the definition of shock in medical terms?
- Excessive blood clotting in the arteries
- Inadequate tissue perfusion and insufficient disposal of cellular waste products (correct)
- Overproduction of red blood cells
- Abnormal increase in heart rate and blood pressure
Which statement correctly describes the role of the heart in maintaining adequate tissue perfusion?
Which statement correctly describes the role of the heart in maintaining adequate tissue perfusion?
- The heart acts as a pump to maintain adequate blood volume and sufficient blood pressure throughout the entire circulatory system. (correct)
- The heart filters out cellular waste products from the blood.
- The heart breaks down glucose to provide energy to body tissues.
- The heart increases the number of white blood cells in response to infection.
In a healthy adult, what is the average normal heart rate?
In a healthy adult, what is the average normal heart rate?
- 120 to 150 beats per minute
- 60 to 90 beats per minute (correct)
- 30 to 60 beats per minute
- 90 to 120 beats per minute
What is the normal stroke volume of the heart in a healthy adult per heartbeat?
What is the normal stroke volume of the heart in a healthy adult per heartbeat?
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What is the mean pressure in big arteries of a normal healthy adult?
What is the mean pressure in big arteries of a normal healthy adult?
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What is the mean pressure in arterioles of a normal healthy adult?
What is the mean pressure in arterioles of a normal healthy adult?
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Study Notes
Shock
- Shock is a life-threatening condition characterized by inadequate tissue perfusion and insufficient disposal of cellular waste products.
Physiology of Circulation
- Three factors are responsible for maintaining adequate tissue perfusion:
- The Heart:
- Acts as a pump to maintain adequate blood volume at sufficient blood pressure throughout the circulatory system.
- Normal heart rate: 60-90 beats per minute in a healthy adult.
- Normal stroke volume: approximately 70ml per heartbeat.
- Heart rate and stroke volume correlate with blood volume and systolic blood pressure of 120mmHg.
- Blood Pressure in a Healthy Adult:
- Mean pressure in big arteries: 95mmHg.
- Mean pressure in arterioles: 35mmHg.
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