Body Systems I (Circulatory, Respiration, Excretion)

One of the functions of the liver is to

• A. remove toxic compounds from the blood
• B. secrete digestive enzymes into the stomach
• C. produce white blood cells
• D. digest large food molecules

The diagram below shows a major system of the human body. Which of the following best describes the function of this system?

• A. absorbing nutrients from food
• B. protecting the body from infection
• C. exchanging gases with the environment
• D. responding to stimuli in the environment

Capillaries are part of which body system?

• skeletal
• nervous
• digestive
• circulatory

High levels of carbon dioxide in the blood trigger which of the following responses in the body?

• A. an increase in the rate of digestion
• B. an increase in the rate of breathing
• C. a decrease in the speed of the pulse
• D. a decrease in the production of sweat

Which of the following is one of the functions of the human skeleton?

• producing hormones
• bringing gases into the body
• removing waste from the body
• providing a site for blood cell formation

Which of the following is a correct order in which air moves through the human respiratory system when a person inhales?

• A. nose, larynx, trachea, pharynx, bronchi, lungs
• B. nose, pharynx, larynx, trachea, bronchi, lungs
• C. pharynx, bronchi, nose, larynx, trachea, lungs
• D. pharynx, nose, trachea, bronchi, larynx, lungs

Which of the following organs removes extra water from the blood to keep the amount of fluid in the bloodstream at the proper level?

• A. kidneys
• B. liver
• C. pancreas
• D. stomach

Which of the following statements best explains why oxygen diffuses from the alveoli into the blood?

• A. The diaphragm draws oxygen into the alveoli at a rapid speed.
• B. Alveoli cells contain hemoglobin to transfer gases to the blood.
• C. The concentration of oxygen is greater in the alveoli than in the blood.
• D. Red blood cells move one at a time through the capillaries surrounding the alveoli.