The respiratory organ in insects is:
a. lungs
b. tracheae
c. gills
d. skin
Answer: b. tracheae

The respiratory pigment found in red blood cells that binds with oxygen is:
a. myoglobin
b. hemoglobin
c. cytochrome
d. chlorophyll
Answer: b. hemoglobin

The process by which carbon dioxide is removed from the body is called:
a. inhalation
b. exhalation
c. respiration
d. ventilation
Answer: b. exhalation

The exchange of gases between blood and body tissues is called:
a. external respiration
b. internal respiration
c. cellular respiration
d. pulmonary respiration
Answer: b. internal respiration

The structure that separates the thoracic cavity from the abdominal cavity and is important for breathing is the:
a. diaphragm
b. trachea
c. bronchi
d. alveoli
Answer: a. diaphragm

The process by which oxygen is transported from the lungs to the body tissues is called:
a. external respiration
b. internal respiration
c. ventilation
d. systemic circulation
Answer: d. systemic circulation

The respiratory center that controls breathing is located in the:
a. medulla oblongata
b. pons
c. cerebellum
d. thalamus
Answer: a. medulla oblongata

The gas that is used by cells during cellular respiration is:
a. oxygen
b. carbon dioxide
c. nitrogen
d. hydrogen
Answer: a. oxygen

The exchange of gases between the lungs and the atmosphere is called:
a. external respiration
b. internal respiration
c. cellular respiration
d. pulmonary respiration
Answer: a. external respiration

The organ that is responsible for gas exchange in humans is:
a. lungs
b. tracheae
c. gills
d. skin
Answer: a. lungs