Respiratory System

Respiratory System

University

40 Qs

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Respiratory System

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Assessment

Quiz

Biology

University

Easy

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NURHIDAYAH AHAMAD

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40 questions

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1.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

Media Image
Which of the following is the primary muscle involved in respiration?
Diaphragm
Pectoralis major
Latissimus dorsi

Biceps brachii

Answer explanation

The diaphragm is the main muscle involved in respiration. During inhalation, it contracts and moves downward, increasing the thoracic cavity's volume and allowing air to enter the lungs.

2.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

Media Image
What is the main function of the alveoli in the lungs?
Transport oxygen to tissues
Produce mucus
Exchange gases between air and blood
Filter out dust and particles

Answer explanation

The alveoli are tiny air sacs in the lungs where gas exchange occurs. Oxygen from inhaled air passes through the alveolar walls into the blood, and carbon dioxide from the blood passes into the alveoli to be exhaled.

3.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

Media Image
Which part of the brain controls the respiratory rate?
Cerebellum
Medulla oblongata
Hypothalamus
Thalamus

Answer explanation

The medulla oblongata is responsible for regulating the respiratory rate by sending signals to the respiratory muscles based on the body's oxygen and carbon dioxide levels.

4.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

Media Image
During inhalation, the diaphragm:
Contracts and moves upward
Relaxes and moves upward
Contracts and moves downward
Relaxes and moves downward

Answer explanation

During inhalation, the diaphragm contracts and moves downward, creating a negative pressure within the thoracic cavity that draws air into the lungs.

5.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

Media Image
What is the normal partial pressure of oxygen (PaO2) in arterial blood?
35-45 mmHg
50-70 mmHg
75-100 mmHg
90-120 mmHg

Answer explanation

The normal partial pressure of oxygen in arterial blood is 75-100 mmHg, indicating the amount of oxygen available for tissues.

6.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

Media Image
What is the significance of surfactant in the lungs?
Increases oxygen binding to hemoglobin
Reduces surface tension in the alveoli
Enhances mucus production
Facilitates carbon dioxide removal

Answer explanation

Surfactant is a substance produced by Type II alveolar cells that reduces surface tension, preventing the alveoli from collapsing and ensuring efficient gas exchange.

7.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

Media Image
Which structure prevents food from entering the respiratory tract?
Epiglottis
Trachea
Bronchi
Larynx

Answer explanation

The epiglottis is a flap of tissue that covers the opening of the trachea during swallowing, preventing food and liquids from entering the respiratory tract.

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