Blood Flow

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.

• A low blood pH decreases the rate of diffusion through the blood vessels and leads to slow blood flow.

• The changing of the shape of red blood cells to a crescent shape decreases resistance and lead to a faster blood flow.

• The narrowing of blood vessels increases pressure and leads to a faster blood flow.

Which of the following factors would most directly affect blood flow through the circulatory system?

• blood pressure

• blood sugar

• respiratory rate

• outside temperature

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What causes blood pressure?

• cholesterol in the blood

• stress that exercise puts on heart muscle

• contraction of the ventricles in the heart

• removal of oxygen from the blood

Which of the following best describes the connection between cardiovascular disease and age?

• As people age, their blood vessels become more elastic leading to less cardiovascular disease.

• As people age, the heart becomes more efficient with each pump, increasing cardiac output.

• As people age, blood pressure decreases leading to more cardiovascular disease.

• As people age, plaque builds up in the arteries increasing vessel resistance, which leads to disease.

The picture below shows the exchange of oxygen and carbon dioxide through a capillary wall.

This picture shows the exchange of gases between which two body systems?

• circulatory and digestive

• circulatory and respiratory

• endocrine and circulatory

• respiratory and endocrine

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The picture below models a blood vessel carrying different components of blood. If human blood did not contain component C, which function could you conclude the blood incapable of ?

• clotting

• fighting disease

• carrying oxygen

• having red color