BASIC CONCEPTS
Which option best defines breathing?
A. Movement of blood in the body
B. A biological process that releases energy and removes waste gases
C. A disease of the lungs
B. A biological process that releases energy and removes waste gases
The alveoli are best described as:
A.Tiny air sacs with thin walls
B.Large air tubes
C. Muscular structures
D. Cartilage rings
A.Tiny air sacs with thin walls
Which structure connects the larynx to the bronchi?
Trachea
What happens during inspiration?
A. Diaphragm relaxes
B. Thoracic cavity volume decreases
C. Intercostal muscles contract
D. Air leaves the lungs
C. Intercostal muscles contract
Which condition involves inflammation and narrowing of bronchioles?
A. Pneumonia
B. Asthma
C. Silicosis
D. Asbestosis
B. Asthma
Why is respiration essential for living organisms?
A. It produces hormones
B. It helps digestion
C. It provides energy for life processes
C. It provides energy for life processes
Which stage releases energy inside the cells?
Cellular respiration
Where are the lungs located?
Thoracic cavity
Why does air enter the lungs during inspiration?
A. Lung pressure increases
B. Lung volume decreases
C. Diaphragm becomes curved
D. Thoracic cavity volume increases
D. Thoracic cavity volume increases
Why is smoking dangerous to the respiratory system?
It damages cilia and lung tissue
Which gas is mainly used during respiration?
Oxygen
Where does gas exchange with blood occur?
A. Trachea
B. Bronchi
C. Alveoli
D. Nasal cavity
C. Alveoli
What prevents dust and bacteria from entering the lungs?
A. Blood vessels
B. Cartilage
C. Mucus and cilia
C. Mucus and cilia
Which muscle plays the main role in breathing?
Diaphragm
Asbestosis occurs due to inhalation of:
Asbestos fibers
Which gas is released as a waste product of respiration?
Carbon dioxide
Which stage involves gas movement between the environment and lungs?
A. External gas exchange
B. Cellular respiration
C. Internal respiration
A. External gas exchange
What is the correct order of air passage?
A. Nose → bronchi → trachea → lungs
B. Nose → trachea → bronchi → alveoli
C. Trachea → nose → bronchi → lungs
D. Nose → alveoli → trachea → bronchi
B. Nose → trachea → bronchi → alveoli
During expiration, which change occurs?
A. Diaphragm contracts
B. Ribs move up
C. Lung volume decreases
D. Air enters lungs
C. Lung volume decreases
Silicosis is mainly caused by:
Inhalation of silica dust
Respiration occurs in:
A. Only plants
B. Only animals
C. All living organisms
C. All living organisms
How many stages does human respiration have?
3
Which structure filters, warms, and moistens inhaled air?
Nasal cavity
Breathing movements occur due to changes in:
A. Blood flow
B. Lung volume
C. Body temperature
D. Heart rate
B. Lung volume
Which disease is caused by a bacterium?
Tuberculosis
Pneumonia