G. Factors that Effect Blood Flow

A high viscosity of blood causes an increased resistance in the blood vessels and leads to slow blood flow.

• True

• False

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

• True

• False

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

• True

• False

Tags

NGSS.HS-LS1-3

Viscosity refers to the thickness of blood.

• True

• False

Blood thickness (viscosity) is caused by the number of red blood cells. Thick blood travels through blood vessels at a slower rate than thin blood.

• True

• False

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

• blood pressure

• blood sugar

• respiratory rate

• outside temperature

The factors that most directly affect blood flow are blood pressure, blood volume, resistance and activity level.

• True

• False

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

Blood pressure is caused by contraction of the ventricles of the heart and also by the elasticity of the arterial walls

• True

• False

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 

• Line A

• Line B

• Line C

• Line D

Tags

NGSS.HS-LS1-3