CFA #2 Unit 3 Human Body Systems (21.2 & 21.3)

Which system is responsible for breaking apart food into molecules that cells can use?

• circulatory system
• digestive system
• excretory system
• lymphatic system
• respiratory system

Which system is responsible for eliminating metabolic wastes from the body?

• circulatory system
• digestive system
• excretory system
• lymphatic system
• respiratory system

Which system is responsible for delivering food and oxygen to cells, and removing wastes?

• circulatory system
• digestive system
• excretory system
• lymphatic system
• respiratory system

Which system is responsible for “screening” fluids for microorganisms, and returning fluids to the blood?

• circulatory system
• digestive system
• excretory system
• lymphatic system
• respiratory system

Which system is responsible for delivering oxygen to the blood, and removing carbon dioxide?

• circulatory system
• digestive system
• excretory system
• lymphatic system
• respiratory system

Which is an example of mechanical digestion that occurs in the human digestive system?

• Saliva in the mouth acts to moisten and break apart food molecules.
• The muscular lining of the esophagus pushes food from the mouth to the stomach.
• The muscular walls of the stomach act to churn food back and forth.
• Small molecules, such as glucose, are absorbed into the blood from the small intestine.

Yasmine uses the model of a double pump to describe the human heart. Which statement about the human heart explains why Yasmine’s model is reasonable?

• The heart has two chambers: one chamber for receiving blood and one chamber for pumping blood.
• The heart has four chambers divided into two sides: one side for receiving blood and one side for pumping blood.
• The heart has four chambers divided into two sides: one side for pumping blood to the lungs, and one side for pumping blood to the rest of the body.
• The heart has two pairs of equal-sized chambers, and each pair pumps blood to approximately half of the body.

Both the liver and kidneys are organs of the excretory system. How do the two organs work together to complete a task?

• The kidneys convert nitrogenous wastes into urea, and the liver filters urea from the blood.
• The kidneys filter urea from the blood to make urine, while the liver filters urea from blood to make lymph.
• The liver converts nitrogenous wastes into urea, and the kidneys filter urea from the blood.
• The liver filters urea from the blood and passes it to the kidneys, which eliminate the urea in urine.

Organs of the lymphatic system include lymph nodes, the thymus, and the spleen. These organs are also part of what other body system?

• the immune system
• the circulatory system
• the digestive system
• the endocrine system

Oxygen and carbon dioxide exchange between the circulatory system and the respiratory system. During this process, both gases diffuse across a moist membrane. What two structures does the membrane separate?

• vein and artery

• capillary (tiny blood vessels) and alveoli (air sacs in lungs)

• alveoli and vein

• artery and vein