Question 1

Which structure in the human respiratory system is commonly known as the 'Voice Box'?

Accepted Answer

Larynx. The larynx contains the vocal cords which vibrate to produce sound. It is located between the pharynx and the trachea. This organ also protects the lower airways by closing during swallowing.

Question 2

What is the primary site of gaseous exchange in the human lungs?

Accepted Answer

Alveoli. Alveoli are tiny air sacs where oxygen enters the blood and carbon dioxide leaves it. They provide a massive surface area to maximize the efficiency of gas diffusion. A network of thin capillaries surrounds each alveolus to facilitate this process.

Question 3

Which pigment in the blood is responsible for transporting the majority of oxygen?

Accepted Answer

Hemoglobin. Hemoglobin is an iron-rich protein found in red blood cells that binds with oxygen. It carries oxygen from the lungs to the various tissues of the body. This pigment also gives blood its characteristic red color.

Question 4

The muscular partition that separates the thoracic cavity from the abdominal cavity is called the?

Accepted Answer

Diaphragm. The diaphragm is a dome-shaped muscle that is essential for the mechanics of breathing. It contracts and flattens during inhalation to increase the volume of the chest cavity. This movement creates a vacuum that pulls air into the lungs.

Question 5

What prevents food from entering the windpipe during swallowing?

Accepted Answer

Epiglottis. The epiglottis is a leaf-shaped flap of cartilage that covers the opening of the larynx. It ensures that food and liquids are directed into the esophagus rather than the trachea. If this mechanism fails, it can lead to choking or aspiration.

Respiratory System — Set 1