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Large veins

Small veins and venules

Systemic Lungs Heart Systemic Capillaries veins 10-12% 8-11% arteries 4-5% 60-70% 10-12%

Figure 15.33

Most of the blood volume is contained within the veins and venules.

male at rest. The volume discharged from the ventricle per minute is called the cardiac output. It is calculated by multiplying the stroke volume by the heart rate in beats per minute. (Cardiac output = stroke volume x heart rate.) Thus, if the stroke volume is 70 milliliters and the heart rate is 72 beats per minute, the cardiac output is 5,040 milliliters per minute.

Blood pressure varies with the cardiac output. If either the stroke volume or the heart rate increases, so does the cardiac output, and, as a result, blood pressure

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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