1 test

What is the primary function of the respiratory system? a) Transport blood b) Exchange gases (O2 and CO2) c) Digest food d) Regulate heart rate

• c) Produce hormones

• d) Control body temperature

• a) Filter toxins

• b) Exchange gases (O2 and CO2)

Which organ is the main site for gas exchange in the human body? a) Nose b) Trachea c) Lungs d) Larynx

• c) Lungs

• Kidneys

• Heart

• Skin

What is the role of the alveoli in the lungs? a) Filter dust from the air b) Exchange gases between air and blood c) Transport blood d) Store oxygen

• a) Absorb nutrients from the air

• d) Produce mucus for the respiratory system

• c) Regulate body temperature

• b) Exchange gases between air and blood

Which muscle is primarily responsible for breathing? a) Intercostal muscles b) Diaphragm c) Abdominal muscles d) Shoulder muscles

• Pectoral muscles

• Latissimus dorsi

• Trapezius muscles

• b) Diaphragm

Exhalation is usually which type of process? a) Active process b) Passive process c) Requires energy d) Requires oxygen

• a) Inhalation process

• d) Active energy consumption

• b) Passive process

• c) Requires carbon dioxide

The majority of carbon dioxide in the blood is transported as: a) Dissolved CO2 b) Carbaminohemoglobin c) Bicarbonate ions (HCO3) d) Bound to plasma proteins

• Carbon monoxide (CO)

• Carbonic acid (H2CO3)

• c) Bicarbonate ions (HCO3)

• Carboxyhemoglobin

Which of the following is the normal volume of air inhaled or exhaled in a single breath during relaxed breathing? a) Tidal volume b) Vital capacity c) Residual volume d) Total lung capacity

• a) Tidal volume

• Inspiratory reserve volume

• Functional residual capacity

• Expiratory reserve volume

What is the primary gas that the body needs to inhale? a) Nitrogen b) Oxygen c) Carbon dioxide d) Helium

• Krypton

• Neon

• Argon

• b) Oxygen

What structure prevents food from entering the trachea during swallowing? a) Epiglottis b) Larynx c) Pharynx d) Bronchi

• Stomach

• Esophagus

• a) Epiglottis

• Diaphragm

Which part of the brain regulates the rate of breathing? a) Cerebrum b) Cerebellum c) Medulla oblongata d) Pons

• Thalamus

• Corpus callosum

• Hypothalamus

• c) Medulla oblongata