Circulatory System

These transport oxygen throughout the body. Also known as erythrocytes.

• red blood cells

• white blood cells

• platelets

• viscosity

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These defend the body against invaders. Also known as leukocytes.

• red blood cells

• white blood cells

• platelets

• viscosity

Their main role is to help in blood clotting.

• red blood cells

• white blood cells

• platelets

• viscosity

People will always have a fixed (the same) number of erythrocytes, regardless of where they live.

• True

• False

What is the correlation between altitude and Red Blood Cell count?

• At a higher altitude, RBC number will increase immediately

• At a higher altitude, RBC number will increase in a matter of months

• At a lower altitude, RBC number will increase, although not immediately

• At a lower altitude, RBC number will increase in a matter of months

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With less oxygen as altitude increases, what is the immediate effect of high altitude on the cardiovascular system?

• Increase in heart rate for a faster exchange of O₂ and CO₂

• Increase in the number of erythrocytes

• Decrease in heart rate to slow down the exchange of O₂ and CO₂

• Decrease in the number of erythrocytes

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What is another word for Red Blood Cell?

• erythrocyte

• leukocyte

• platelet

• monocyte

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What is another word for White Blood Cell?

• erythrocyte

• leukocyte

• platelet

• monocyte

What would be a mechanism used by the circulatory system to reduce blood loss following a significant cut or wound?

• Vasoconstriction

• Vasodilation

• Increase in blood pressure

• Decrease in blood viscosity

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NGSS.HS-LS1-3

How would vasoconstriction help reduce blood loss?

• Blood would be transported to the skin and away from the organs

• Blood would be transported away from the skin and deeper into the organs

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