Cardiovascular & Immune System

Front

Which factor affects blood flow in the human body?

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

Back

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

Front

What causes blood pressure? Options: Cholesterol in the blood, Stress that exercise puts on heart muscle, Contraction of the ventricles in the heart, Removal of oxygen from the blood.

Back

Contraction of the ventricles in the heart

Answer explanation

When the ventricles contract the pump out the blood into the arteries, thus causing the pressure to flow through.

Front

Which factor most directly affects blood flow through the circulatory system? Options: Blood pressure, Blood sugar, Respiratory Rate, Outside Temperature

Back

Blood pressure

Front

In arteriosclerosis, hardened arteries cannot expand to handle the blood that enters the vessel when the heart contracts. Therefore, pressure _____ in the artery and causes the heart to work ______.

Back

increase, more

Front

How does the change in the diameter of the artery affect the flow of blood?

Back

Decreases the flow of blood due to a decrease in the diameter of the artery.

Front

Which action will increase blood flow throughout the body?

Back

dilation of blood vessels

Front

How can a person's health be affected by heredity? Options: A person with a family history of obesity is more likely to catch a common cold. A person with a family history of high blood pressure is more likely to have heart disease. A person with a family history of obesity is less likely to enroll in a weight loss plan. A person with a family history of cancer is less likely to be screened for cancer.

Back

A person with a family history of high blood pressure is more likely to have heart disease.

Front

How does the immune system differentiate a pathogen from human body cells?

Back

Pathogens and body cells have different surface proteins, or antigens, that the immune system recognizes.

Answer explanation

Body cells have different antigens than pathogen. In this picture the pathogen is representing a pointy triangle. A body cell antigen may have a rounded antigen.

Front

Which substances may form in the human body due to invaders entering the blood?

Back

antibodies

Front

Which is an example of a non-specific immune response?

Back

I and II only