Respiratory SySTEM Quiz - Skill 1 And Skill 2

Explanation
During exhalation, when the diaphragm relaxes and the volume of the chest cavity decreases, the air pressure inside the lungs decreases. This is because as the volume of the chest cavity decreases, there is less space for the air to occupy, causing the air molecules to become more compressed and the pressure to decrease.

Explanation
As a child holds his or her breath, carbon dioxide levels increase, stimulating breathing by the brain stem. This is because when we hold our breath, carbon dioxide builds up in our body. The brain stem detects this increase in carbon dioxide and sends signals to stimulate breathing. This mechanism ensures that our body gets enough oxygen and prevents us from holding our breath until we die.

Explanation
In the alveoli and lung capillaries, the exchange of carbon dioxide and oxygen occurs through diffusion. Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In this case, oxygen moves from the alveoli, where its concentration is higher, to the lung capillaries, where its concentration is lower. At the same time, carbon dioxide moves from the lung capillaries, where its concentration is higher, to the alveoli, where its concentration is lower. This exchange of gases is facilitated by the thin walls and large surface area of the alveoli, allowing for efficient diffusion.

Explanation
The bronchiole is the last structure to be encountered as air is inhaled. After passing through the trachea and entering the bronchi, the air then enters the smaller bronchioles. The bronchioles are the smallest airways in the respiratory system and lead to the alveoli, where gas exchange occurs. Therefore, the bronchiole is the final structure that the inhaled air encounters before reaching the site of gas exchange in the lungs.

Explanation
The left picture corresponds to inhalation because it shows a person taking a deep breath in, with their chest expanding and their diaphragm lowering. This is the typical physical movement that occurs during inhalation, allowing air to enter the lungs. The right picture does not depict this action, so it does not correspond to inhalation.