GENERAL ANATOMY
CARDIOVASCULAR SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The narrowing of blood vessels increases pressure and leads to a faster blood flow.
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The changing of the shape of red blood cells to a crescent shape decreases resistance and lead to a faster blood flow.
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A low blood pH decreases the rate of diffusion through the blood vessels and leads to slow blood flow.
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A high viscosity of blood causes an increased resistance in the blood vessels and leads to slow blood flow.
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Detailed explanation-1: -The rate at which blood flows through the human body changes in response to many factors. Which statement describes one of these factors and its effect on blood flow? A high viscosity of blood causes an increased resistance in the blood vessels and leads to slow blood flow.
Detailed explanation-2: -You need to know the factors that affect blood flow through the cardiovascular system: blood pressure, blood volume, resistance, disease and exercise.
Detailed explanation-3: -In the aorta, the blood travels at 30 cm/sec. From the aorta, blood flows into the arteries and arterioles and, ultimately, to the capillary beds. As it reaches the capillary beds, the rate of flow is dramatically (one-thousand times) slower than the rate of flow in the aorta.
Detailed explanation-4: -The three factors that govern local blood flow are pressure, the resistance to flow, and blood viscosity. Pressure: The pressure in a vessel is caused by the force of blood pushing against its walls. This force can be increased or decreased depending on the vessel’s diameter, length, and wall thickness.
Detailed explanation-5: -As blood flows through the circulatory system, energy is continuously lost because of the friction between the layers of flowing blood. Both pressure and kinetic energy levels decrease as the red cells transit from the arterial to the venous system.