Blood Distribution and Redistribution Quiz

What regulates the diameter of arteries and arterioles?

• Involuntary control of smooth muscle

• Automatic control by the heart

• Voluntary control of skeletal muscles

• Conscious control of the brain

What happens if all smooth muscle in blood vessels relaxes?

• Heart rate increases

• Blood pressure increases

• Blood pressure decreases

• Heart rate decreases

During exercise, which muscles demand the most blood flow?

• Inactive muscles

• Active muscles

• Heart muscles

• Digestive muscles

What percentage of total blood flow can active muscles demand during exercise?

• 20%

• 10%

• 50%

• 90%

How is blood flow to non-essential organs reduced during exercise?

• By dilating arterioles

• By constricting arterioles

• By increasing heart rate

• By decreasing heart rate

What is the role of precapillary sphincters during exercise?

• To open and increase blood flow to active muscles

• To close and increase blood flow to the brain

• To open and decrease blood flow to the heart

• To close and decrease blood flow to the skin

What is the main demand on blood flow during exercise?

• The digestive system

• The active muscles

• The heart

• The brain

What happens to blood flow to organs not requiring oxygen exchange during exercise?

• It increases

• It stops completely

• It remains the same

• It decreases

What is the function of the cardiovascular system during exercise?

• To increase blood pressure

• To maintain blood pressure

• To decrease blood pressure

• To stop blood flow

Which system coordinates with the cardiovascular system to regulate blood flow?

• The digestive system

• The respiratory system

• The nervous system

• The endocrine system