Exam 23: Circulation

During exercise, your cardiac output can increase dramatically in order to meet the metabolic demands of your tissues. If your heart rate increased to 150 beats per minute and the volume of blood pumped per beat is 75 mL, what is your cardiac output?

In mammals, which of the following vessels transports oxygenated blood from the lung back to the heart?

You conduct a study with mice to determine whether giving them air with a higher than normal oxygen level results in their having a higher than normal oxygen content in their blood. What vessel should you draw blood from if you want to measure the highest potential level of oxygen content in the blood?

Cardiac output is defined as the volume of blood pumped by a(n)________ each time it contracts.

A woman has been standing in one place without moving for a long time. You walk by and notice that her ankles are swollen. What is a likely explanation for this observation?

Using a stethoscope, you listen to a beating heart and hear "lub-dup, lub-dup." These sounds are created by

During which phase of the heartbeat does the heart fill with blood?

Which of the following factors contributes to the flow of blood in veins?

Which of the following can contribute to high blood pressure?

An adult human's red blood cells are formed in the

At any given time, what percentage of the body's capillaries have blood flowing through them?

Stem cells found in the red marrow inside bones

Blood clots are formed by platelets and the plasma protein

Which of the following statements regarding circulatory systems is true?

Which of the following statements regarding blood pressure is false?

Blood flow through capillaries is controlled by

The location of the heart's pacemaker is a specialized region of cardiac muscle called the

During ventricular systole, the ________ valves ________.

Myocardial infarction, also called a heart attack,

The diameter of a capillary is about the same as that of