Activity 4.5 Respiratory System

Identify the organ of respiration labeled with the letter "B" in the image and provide its name.

• Bronchiole

• Mouth

• Lungs

• Trachea

Answer explanation

The organ labeled 'B' is the bronchiole, which is a small airway in the lungs that branches from the bronchi and leads to the alveoli, where gas exchange occurs. This makes it a key component of the respiratory system.

Identify the organ of respiration labeled with the letter "D" in the image and provide its name.

• Nose/Nasal Activity

• Lungs

• Esophagus

• Diaphragm

Answer explanation

The organ labeled 'D' is the Nose/Nasal Activity, which is the primary entry point for air in the respiratory system. It filters, warms, and humidifies the air before it reaches the lungs.

Identify the organ of respiration labeled with the letter "G" in the image and provide its name.

• Bronchi

• Trachea

• Alveoli

• Larynx

Answer explanation

The organ labeled 'G' is the bronchi, which are the main passageways that branch from the trachea into the lungs, allowing air to enter. The other options, such as the trachea and larynx, serve different functions in the respiratory system.

Identify the organ of respiration labeled with the letter "C" in the image and provide its name.

• Alveoli

• Trachea

• Bronchi

• Diaphragm

Answer explanation

The organ labeled 'C' is the alveoli, which are tiny air sacs in the lungs where gas exchange occurs. They are essential for respiration, allowing oxygen to enter the blood and carbon dioxide to be expelled.

During ________, the diaphragm contracts and air is drawn into the lungs.

• Inhalation

• Exhalation

• Circulation

• Digestion

Answer explanation

During inhalation, the diaphragm contracts, creating a vacuum that draws air into the lungs. This process is essential for breathing, unlike exhalation, which involves the diaphragm relaxing and pushing air out.

The tiny air sacs in the lungs where ________ occurs are called ________.

• gas exchange, alveoli

• digestion, villi

• filtration, nephrons

• absorption, capillaries

Answer explanation

The tiny air sacs in the lungs where gas exchange occurs are called alveoli. They are essential for oxygen and carbon dioxide exchange, making this the correct choice.

When you breathe out, you are expelling ________ from your body.

• carbon dioxide

• oxygen

• nitrogen

• hydrogen

Answer explanation

When you breathe out, your body expels carbon dioxide, a waste product of metabolism. Oxygen is inhaled, while nitrogen and hydrogen are not significant components of exhaled air.

The movement of air into and out of the lungs is called ________.

• gas exchange

• respiration

• ventilation

• breathing

Answer explanation

The movement of air into and out of the lungs is specifically referred to as ventilation. While breathing and respiration are related, ventilation is the precise term for this air movement process.

The ________ is a muscle that helps control the breathing process.

• diaphragm

• lung

• heart

• stomach

Answer explanation

The diaphragm is a dome-shaped muscle located below the lungs that contracts and relaxes to facilitate breathing. It plays a crucial role in the inhalation and exhalation process, making it the correct answer.

The trachea is also known as the voice box.

• True

• False

Answer explanation

The trachea is not the voice box; it is the windpipe that connects the throat to the lungs. The voice box is actually called the larynx. Therefore, the statement is false.