Circulatory System

The main function of the circulatory system is 

• To give the body structure and support
• Excrete waste
• transport blood, nutrients, and gases throughout the body
• to transport messages from the body to the brain

The job of the heart is to . . .

• pump blood around the body.

• send food to the small intestines.

• break down food.

• give energy to the body.

State one reason why blood at location B contains more oxygen than blood at location A.

• because blood at location A goes to the lungs

• because blood at location A comes from the lungs

• because blood at location B comes from the lungs

• because blood at location B goes to the lungs

What is the responding variable in this experiment?

• Trial number

• type of exercise

• average heart rate

• average heart rate before and after exercise

State the general relationship between exercise and heart rate in humans.

• If a person exercises, then their heart rate will not change

• If a person exercises, then their heart rate will increase

• If a person exercises, then their heart rate will decrease

• Person exercising and heart rate are not related

The Blood Vessels where the exchange of Oxygen and CO2 (carbon dioxide) takes place are the_______.

• Arteries
• Veins
• Capillaries

How does the heart work?

• It pumps blood first to the lungs, back to the heart and then around the rest of the body.

• It pumps blood first to the rest of the body, back to the lungs and then to the heart.

• It pumps blood around the rest of the body, back to the heart and then to the lungs,

Which best describes the relationship between the muscular system and the circulatory system? 

• The circulatory system captures carbon dioxide from the air for muscle energy.
• The circulatory system produces red blood cells to bring oxygen to the muscles
• The circulatory system provides a framework for muscle movement
• The circulatory system delivers oxygen for muscle energy

What do Red-Blood cells do?

• Carry oxygen from the lungs to the body cells and  transport carbon dioxide from the cells back to the lungs
• keeps blood flowing in one direction to the heart and prevent blood from flowing backwards
• Collects  blood from the capillaries and drain it into the veins
• Bring nutriients to the cells and carries away waste materials.

What is blood pressure?

• Pressure of the blood against the walls of the veins.

• Pressure of the heart pushing the blood out.

• Pressure of the heart receiving blood.

• Pressure of the blood against the walls of the arteries.