Exam 23: Circulation

Whether there is a net flow of fluid into or out of a capillary at a given point along its length depends upon

The largest blood vessel in the human body is the

The liquid part of blood is called

Which kind of vessel has the lowest blood velocity?

You are dissecting a "mystery animal" in biology lab and discover that it has a series of closed blood vessels, a pair of lungs, two atria, and a single ventricle. What animal are you dissecting?

Oxygen-poor blood is carried from the heart of a mammal to the lungs via the

As blood moves away from the heart toward the tissues, the relative size of blood vessels ________, the blood pressure ________, and the velocity of blood flow ________.

In humans, which blood vessels have valves?

To view the path of blood flow through the heart and body, scientists and physicians perform an angiogram by injecting a dye into the blood and monitoring its movement. Imagine that this dye was injected into the pulmonary vein. Which of the following is the correct order of structures that the dye will flow through?

In which part of this figure would blood have the lowest oxygen content?

Which of the following cells are phagocytes?

After reading the paragraphs below, answer the questions that follow. To evaluate cardiac function, scientists and physicians measure both the pressure and the volume inside the heart. When both pressure and volume data are plotted on the same graph, the resulting graph is called a pressure-volume loop. To create a pressure-volume loop, a catheter (a thin tube) is inserted into the vessels of the heart, and measurements of both left ventricular pressure and left ventricular volume are taken. The data are plotted on a graph, and cardiac function can then be evaluated from the distribution of the data and the shape of the loop. The figure below shows a typical left ventricle pressure-volume loop for a healthy young adult. The cardiac cycle proceeds counterclockwise. Each complete turn around the loop (for example, starting at point A and ending back at point A) represents one complete cardiac cycle. -If the time it takes to go around the loop is 1 second, what is the cardiac output in units of liters per minute?

How long do human red blood cells circulate in the blood before they wear out and have to be replaced?

One way that substances move between blood and interstitial fluid is by

Which of the following statements about blood clotting is true?

Plasma proteins are involved in all of the following activities except

Hematocrit is the percentage of red blood cells in the blood. In adult humans, hematocrit is roughly 40-45%, but it can be much higher or lower in other animals. Consider the Weddell seal, a mammal that can dive and hold its breath underwater for upwards of 80 minutes. What is the hematocrit level of a Weddell seal, and why?