Bloodflow

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

Tags

NGSS.HS-LS1-3

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

Tags

NGSS.HS-LS1-3

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

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

Tags

NGSS.MS-LS1-3