Which of the following statements regarding circulatory systems is TRUE
A circulatory system is necessary in any animal whose body is too large or too complex for vital chemicals to reach all parts of the body by diffusion
Which of the following is a function of the circulatory system?
Transporting nutrients to body cells
Adaptation to terrestrial life required major evolutionary changes. The change from gill breathing to lung breathing was accompanied by important changes in the
Which of the following statements about mammalian circulatory systems is false?
The left side of a mammal's heart sends blood to the lungs.
In mammals, blood returning from the head will pass through the ________ just before entering the right atrium.
Superior Vena Cava
In mammals, which of the following vessels transports oxygenated blood from the lung back to the heart?
Cardiac output is defined as the volume of blood pumped by a(n) ________ each time it contracts.
The location of the heart's pacemaker is a specialized region of cardiac muscle called the
Arteries are distinguished from veins based on all of the following features EXCEPT
The amount of oxygen present in the blood
The results suggest that the smallest flow volume would be found in the ___________ of the human body
Which statement best summarizes the results of the experiment?
The larger the tube diameter, the greater the flow volume.
As blood moves away from the heart towards the tissues, the relative size of blood vessels ________, the blood pressure ________, and the velocity of blood flow ________.
Decreases . . . drops. . . slows
Which of the following factors contributes to the flow of blood in veins?
Skeletal muscle contractions
Which of the following statements regarding blood pressure is FALSE?
Hypertension is defined as persistent systolic pressure above 120 and/or diastolic above 80.
Blood flow through capillaries is controlled by
Precapillary sphincters and smooth muscle in the walls of arterioles
What type of blood vessel is solely responsible for exchange between the blood and the interstitial fluid?
One way that substances move between blood and interstitial fluid is by
Pressure-driven flow through clefts between the epithelial cells of the capillary wall.
Whether there is a net flow of fluid into or out of a capillary at a given point along its length depends upon
The balance between blood pressure and osmotic pressure.
Which of the following statements about blood clotting is TRUE?
Threads of fibrin form a fibrin clot