2. What is the main organ of the respiratory system?
3. These are small pouches or sacs in the lungs where exchange of carbon
4. Which part of the circulatory system carries blood throughout the
a. alveoli
b. bronchi
c. diaphragm
d. iungs
dioxide and oxygen takes place.
a. bronchial tube
b. nostrils
c. alveoli
d. nasal cavity
body?
a. blood vessels
b. heart
C. blood
d. veins
5. It is the pumping organ of the circulatory system.
a. heart
b. bioodi
c. blood vessels
d. veins
6. It is referred to as the river of life.
a. blood vessels
.
b. heart
d. capillaries
c. bioodi
7. It is considered as the functional unit of the nervous system,
a. brain
b. neurons
c. muscles
d. bones​