The Circulatory System
Put a tick ( ) in the box next to the correct answers.
1. The pulmonary circuit carries…
(a) deoxygenated blood from the heart around the lungs and oxygenated blood back to the heart.
(b) oxygenated blood from the heart around the lungs and deoxygenated blood back to the heart.
(c) oxygenated blood from the heart around the body.
(d) deoxygenated blood back to the heart from the body.
2. Which feature of the respiratory system has walls that are a one cell thick to allow gaseous
exchange?
(a) artery
(b) capillaries
(c) veins
(d) muscle
3. Arteries (except pulmonary artery) carry…
(a) deoxygenated blood at low pressure from the heart.
(b) oxygenated blood at high pressure from the heart.
(c) deoxygenated blood back at low pressure to the heart.
(d) oxygenated blood at high pressure back to the heart.
4. Heart rate is…
(a) the number of times the heart beats per minute.
(b) the volume of blood ejected from the heart each beat.
(c) the volume of blood ejected from the heart each minute.
(d) the amount of air inspired with each breath.
5. The main function of a red blood cell is…
(a) to fight disease.
(b) to clot blood.
(c) to transport oxygen in the bloodstream.
(d) to keep the body temperature high.
6. The pathway of air through the respiratory system is:
(a) mouth/nose
trachea
bronchiole
(b) mouth/nose
trachea
bronchi
(c) trachea
alveoli
(d) mouth/nose
bronchi
bronchiole
bronchi
alveoli
bronchiole
alveoli
bronchiole
bronchi
alveoli
trachea
7. What is the movement of oxygen and carbon dioxide between the alveoli and the bloodstream
known as?
(a) tidal volume
(b) gaseous exchange
(c) breathing rate
(d) minute ventilation
8. Draw a straight line to match the part of the blood to the correct function.
(4)
Red blood cells (erythrocytes)
Protects against pathogens
White blood cells
(phagocytes and lymphocytes)
Helps the blood to clot
Plasma
Platelets
Transports O2 around the body
Transports dissolved substances
around the body