Read each sentence carefully. Circle the letter of the correct answer.
1. What do you call a muscular organ about the size of a closed fist?
b. blood
a heart
d. trachea
c. ventricles
2. The
is also known as the "red river of life".
a heart
b. blood
c. ventricles d. trachea
3. What do you call the smallest body cells and do not have a definite shape but play a
major role in blood clotting?
a. heart
b. blood
c. ventricles d. platelets
4. The a, blood vessels b. blood c. heart d. vein are the pathways of blood
where flow throughout the body.
5. It prevent the blood from flowing back.
a. blood vessels b. valves
c. heart
d. aorta
6. What do you call the upper chamber of the heart
a. atrium
b. aorta
C. vein
d. ventricle
7. It is composed of three major organs; the heart, blood, and the blood vessels.
a circulatory system b. digestive system c nervous system d. skeletal system
8. Blood vessels that connects the vein and artery.
a, heart
b. capillary
c. ventricles d. trachea
9. Which is elastic and compared to arteries it has thinner walls and bigger in diameter.
a. vein
b. capillary
c. ventricles d. trachea
10. Blood vessels that moved away from the heart.
a. vein
b. capillary
c. artery
11. The following are the function of the respiratory system except
d. trachea
a. act of breathing
b. taking in oxygen and giving off carbon dioxide
c. transport of blood and oxygen to the different part of the body
d. none of the above
12. Where the exchange of carbon dioxide and oxygen takes place.
a. nasal cavity b. throat
c. trachea
d. lungs
13. It is the tiny hair in the nasal cavity that filters the dust and other solid particles
in the air.
a. alveoli
b. cilia
c. mucus
d. nasal cavity
14. When you inhale, the ribs become
a. The rib muscle relax the ribs move inward
b. The rib muscle contract and the ribs move inward
c. The rib muscle relax and the ribs moves outward
d. all of the above​