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Physiology of Circulation: Shock and Blood Pressure

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Physiology of Circulation: Shock and Blood Pressure

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Questions and Answers

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?

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?

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?

70ml Signup and view all the answers

What is the mean pressure in big arteries of a normal healthy adult?

95mmHg Signup and view all the answers

What is the mean pressure in arterioles of a normal healthy adult?

35mmHg Signup and view all the answers

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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Description

Learn about the factors that maintain adequate tissue perfusion, including the heart's role in circulation and blood pressure. Understand the physiology of shock, a life-threatening condition.