The process of inspiration occurs as?
Correct answer: A. The diaphragm contracts, expanding the thoracic cavity
- A. The diaphragm contracts, expanding the thoracic cavity
- B. Passive transport of air occurs
- C. Air expands inside the lungs
- D. Air is pushed into the lungs
Explanation
The correct answer is that the diaphragm contracts, expanding the thoracic cavity. During inspiration, the diaphragm and external intercostal muscles contract, increasing the volume of the thoracic cavity and decreasing the pressure inside. This pressure change allows air to flow into the lungs passively. The other options are incorrect because they either lack specificity regarding the active role of muscles or incorrectly describe the mechanics of air movement.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
Practise Respiration
446 free Respiration MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Human Respiratory System questions
The function of vocal cords is to help in _.
The process through which animals take oxygen (O2) from the air and release carbon dioxide (CO2) into the air is called:
Glottis is lined with:
A surfactant is a secretory product that is composed of:
Loss of lung tissue is caused by:
A series of C shaped cartilage rings are found in the wall of: