Organ System › Respiratory system › Question #10018
MCQ Single Best Answer Easy

Q What condition is necessary for inspiration to occur?

ID: #10018 Respiratory system 101 views
Question Info
#10018Q ID
EasyDifficulty
Respiratory systemTopic
Start Quiz on This Topic
 Your Answer

Choose the Best Option

Click any option to instantly check if you're correct.

  • A No pressure gradient ✔ ✖
  • B Negative pressure in the lungs ✔ ✖
  • C Positive pressure in the lungs ✔ ✖
  • D More pressure in lungs than atmosphere ✔ ✖
Correct Answer: Option B

Explanation

Inspiration is the process of breathing in air, and it occurs when the pressure in the lungs is lower than the atmospheric pressure. This is because the air flows from the region of high pressure (atmosphere) to the region of low pressure (lungs). Thus, a negative pressure gradient is needed to pull the air into the lungs during inspiration. The contraction of the diaphragm and external intercostal muscles increase the volume of the thoracic cavity, which in turn reduces the pressure within the lungs, allowing air to rush in. Therefore, the correct option is B.

 Continue Practice
Previous Question Next Question
 Share

Share This Question

Challenge a friend or share with your study group.

 More from This Topic

Related MCQ Questions

How does high altitude affect the number of red blood cells (RBCs) in human blood? What type of epithelium makes up the alveoli in the lungs? What provides support to trachea, bronchi, and bronchioles? Where is the location of the pneumotaxic center? What is the concentration of oxygen in expired air? What muscles can be used to increase the strength of inspiration and expiration? What is not a characteristic of alveoli? Which chronic respiratory disorder is commonly caused by smoking? Which part of the brain is responsible for regulating the respiratory process? Which of the following is not a component of the human respiratory system?