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Respiratory System and Breathing MCQs with Answers

Respiratory System and Breathing MCQs

Welcome to the Respiratory System and Breathing MCQs with Answers. In this post, we are sharing Respiratory System and Breathing Multiple Choice Questions and Answers in Everyday Science section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding Respiratory System and Breathing online MCQs Test.

What is the primary muscle involved in breathing?
a) Intercostal muscles
b) Diaphragm
c) Pectoral muscles
d) Abdominal muscles

Answer
b) Diaphragm

Which structure is the site of gas exchange in the lungs?
a) Bronchi
b) Alveoli
c) Trachea
d) Bronchioles

Answer
b) Alveoli

The trachea divides into two branches called the:
a) Bronchi
b) Alveoli
c) Larynx
d) Pharynx

Answer
a) Bronchi

What is the main function of the respiratory system?
a) Transport oxygen to cells
b) Remove waste from cells
c) Exchange oxygen and carbon dioxide
d) Produce red blood cells

Answer
c) Exchange oxygen and carbon dioxide

Which structure prevents food from entering the airway during swallowing?
a) Trachea
b) Epiglottis
c) Larynx
d) Esophagus

Answer
b) Epiglottis

The voice box is also known as the:
a) Pharynx
b) Larynx
c) Trachea
d) Bronchus

Answer
b) Larynx

What is the term for the movement of air into and out of the lungs?
a) Respiration
b) Ventilation
c) Circulation
d) Diffusion

Answer
b) Ventilation

The process by which oxygen is taken into the lungs and carbon dioxide is expelled is called:
a) Inhalation
b) Exhalation
c) Respiration
d) Diffusion

Answer
c) Respiration

Which gas is exhaled during breathing?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen

Answer
b) Carbon dioxide

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

Answer
c) Medulla oblongata

How is most oxygen transported in the blood?
a) Dissolved in plasma
b) Attached to hemoglobin in red blood cells
c) In white blood cells
d) Bound to platelets

Answer
b) Attached to hemoglobin in red blood cells

What is the function of the nasal cavity in the respiratory system?
a) Filter, warm, and moisten air
b) Produce sound
c) Exchange gases
d) Regulate airflow to the lungs

Answer
a) Filter, warm, and moisten air

Which of the following structures is responsible for filtering particles from the air we breathe?
a) Trachea
b) Bronchioles
c) Nasal hairs
d) Alveoli

Answer
c) Nasal hairs

Which condition is characterized by the inflammation of the bronchi?
a) Asthma
b) Bronchitis
c) Pneumonia
d) Emphysema

Answer
b) Bronchitis

The exchange of oxygen and carbon dioxide between the blood and the air in the lungs is called:
a) Cellular respiration
b) External respiration
c) Internal respiration
d) Pulmonary ventilation

Answer
b) External respiration

Which muscle contracts to expand the chest cavity during inhalation?
a) Diaphragm
b) Intercostal muscles
c) Pectoralis major
d) Abdominal muscles

Answer
a) Diaphragm

What is the primary cause of respiratory acidosis?
a) Excess oxygen
b) Increased carbon dioxide
c) Decreased oxygen
d) Low pH in the lungs

Answer
b) Increased carbon dioxide

Which part of the respiratory system is commonly known as the windpipe?
a) Pharynx
b) Trachea
c) Larynx
d) Bronchi

Answer
b) Trachea

What is the normal breathing rate for an adult at rest?
a) 5-10 breaths per minute
b) 12-20 breaths per minute
c) 25-30 breaths per minute
d) 30-40 breaths per minute

Answer
b) 12-20 breaths per minute

The smallest airways in the lungs are called:
a) Bronchi
b) Alveoli
c) Bronchioles
d) Tracheoles

Answer
c) Bronchioles

Which respiratory condition is characterized by chronic obstruction of airflow?
a) Asthma
b) Tuberculosis
c) Chronic obstructive pulmonary disease (COPD)
d) Pneumonia

Answer
c) Chronic obstructive pulmonary disease (COPD)

Which gas is necessary for cellular respiration?
a) Nitrogen
b) Oxygen
c) Carbon dioxide
d) Hydrogen

Answer
b) Oxygen

What is the role of surfactant in the lungs?
a) Increases lung capacity
b) Reduces surface tension in the alveoli
c) Filters dust particles
d) Controls breathing rate

Answer
b) Reduces surface tension in the alveoli

Which part of the respiratory system prevents the collapse of the trachea?
a) Diaphragm
b) Cartilage rings
c) Alveoli
d) Intercostal muscles

Answer
b) Cartilage rings

What condition is characterized by the collapse of part or all of a lung?
a) Asthma
b) Atelectasis
c) Bronchitis
d) Tuberculosis

Answer
b) Atelectasis

Which of the following helps control the rate of breathing based on blood pH levels?
a) Medulla oblongata
b) Hypothalamus
c) Cerebellum
d) Cerebrum

Answer
a) Medulla oblongata

What type of blood vessel surrounds the alveoli for gas exchange?
a) Arteries
b) Veins
c) Capillaries
d) Bronchioles

Answer
c) Capillaries

Which structure is responsible for producing sound?
a) Larynx
b) Trachea
c) Pharynx
d) Alveoli

Answer
a) Larynx

The pleura is a membrane that surrounds the:
a) Heart
b) Brain
c) Lungs
d) Liver

Answer
c) Lungs

Which respiratory disease is caused by the bacterium Mycobacterium tuberculosis?
a) Emphysema
b) Tuberculosis
c) Pneumonia
d) Bronchitis

Answer
b) Tuberculosis

What happens during exhalation?
a) The diaphragm contracts
b) The diaphragm relaxes
c) The chest cavity expands
d) Air enters the lungs

Answer
b) The diaphragm relaxes

How is most carbon dioxide transported in the blood?
a) Dissolved in plasma
b) Bound to hemoglobin
c) As bicarbonate ions
d) Attached to red blood cells

Answer
c) As bicarbonate ions

What is the function of the pharynx in the respiratory system?
a) Filter air
b) Produce sound
c) Connect the mouth and nose to the larynx
d) Exchange gases

Answer
c) Connect the mouth and nose to the larynx

Which condition is characterized by damage to the alveoli, making it difficult to breathe?
a) Pneumonia
b) Asthma
c) Emphysema
d) Tuberculosis

Answer
c) Emphysema

What is the oxygen-carrying protein in red blood cells?
a) Hemoglobin
b) Albumin
c) Myoglobin
d) Fibrinogen

Answer
a) Hemoglobin

Which condition is characterized by a temporary cessation of breathing during sleep?
a) Asthma
b) Apnea
c) Emphysema
d) Bronchitis

Answer
b) Apnea

Which respiratory condition is caused by a viral or bacterial infection of the alveoli?
a) Pneumonia
b) Asthma
c) Tuberculosis
d) Bronchitis

Answer
a) Pneumonia

Which part of the respiratory system allows for the passage of air between the nose and trachea?
a) Larynx
b) Pharynx
c) Bronchioles
d) Alveoli

Answer
b) Pharynx

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