Chapter 9.1 Human Body Systems and Defense Assessment

What is homeostasis?

• The process of digesting food

• The ability to maintain steady internal conditions when outside conditions change

• The movement of blood through vessels

• The exchange of gases in the lungs

Which system is responsible for breaking down food into substances that cells can use?

• Respiratory system

• Circulatory system

• Digestive system

• Excretory system

What are the two types of digestion?

• Physical and chemical

• Mechanical and chemical

• Ingestion and absorption

• Physical and mechanical

Where does most digestion occur in the human body?

• Stomach

• Large intestine

• Small intestine

• Esophagus

What is the function of villi in the small intestine?

• To produce enzymes

• To store waste products

• To absorb nutrients and water

• To break down food particles

Which organ filters approximately 140 liters of blood each day?

• Liver

• Kidneys

• Bladder

• Heart

What is the main function of the respiratory system?

• To filter blood

• To digest food

• To absorb nutrients

• To exchange gases

Where does gas exchange occur in the lungs?

• Bronchi

• Trachea

• Alveoli

• Larynx

What are the four chambers of the heart called?

• Ventricles and capillaries

• Atria and arteries

• Atria and ventricles

• Arteries and veins

Which blood vessels are one cell thick and allow for exchange of materials?

• Arteries

• Veins

• Capillaries

• Arterioles