1.
Which of the following are the primary organs of the respiratory system?
Correct Answer
A. Lungs, bronchus, trachea
Explanation
The primary organs of the respiratory system are the lungs, bronchus, and trachea. These organs work together to facilitate the process of breathing. The lungs are responsible for the exchange of oxygen and carbon dioxide, while the bronchus and trachea help in the passage of air to and from the lungs. Together, these organs play a crucial role in the respiratory system's function of providing oxygen to the body and removing waste gases.
2.
The function of the respiratory system is to supply which of the following to the organs of the body?
Correct Answer
B. Oxygen (O2)
Explanation
The respiratory system is responsible for supplying oxygen to the organs of the body. Oxygen is essential for cellular respiration, which is the process that generates energy in the form of ATP for the body's cells. Without oxygen, the cells would not be able to produce enough energy to carry out their functions. Therefore, the respiratory system plays a crucial role in delivering oxygen to the organs and tissues of the body.
3.
Gas exchange between the blood and the respiratory system occurs in which area?
Correct Answer
D. Alveoli
Explanation
Gas exchange between the blood and the respiratory system occurs in the alveoli. The alveoli are tiny air sacs located at the end of the bronchioles in the lungs. They are surrounded by capillaries, which allow for the exchange of oxygen and carbon dioxide between the air in the alveoli and the blood. Oxygen from the air diffuses into the bloodstream, while carbon dioxide, a waste product, diffuses out of the bloodstream into the alveoli to be exhaled. This exchange of gases is essential for respiration and supplying oxygen to the body's tissues.
4.
Which are of the brain is responsible for sending motor impulses to stimulate inhalation?
Correct Answer
A. Medulla
Explanation
The medulla is responsible for sending motor impulses to stimulate inhalation. Located at the base of the brainstem, it controls vital functions such as breathing, heart rate, and blood pressure. It contains neurons that send signals to the muscles involved in the inhalation process, allowing for the intake of oxygen into the lungs. The medulla plays a crucial role in maintaining the body's respiratory rhythm and ensuring the proper functioning of the respiratory system.
5.
Inhaled air is warmed and moistened as it passes through what area?
Correct Answer
B. Nasal mucosa
Explanation
The nasal mucosa is responsible for warming and moistening the inhaled air as it passes through the nasal cavity. The nasal mucosa contains a network of blood vessels that help to warm the air to body temperature. It also has specialized cells that produce mucus, which helps to humidify the air and trap any particles or pathogens present in the air. This process ensures that the air reaching the lungs is at the right temperature and humidity level for optimal respiratory function.
6.
What structure covers the larynx during swallowing?
Correct Answer
C. Epiglottis
Explanation
The epiglottis is a flap of cartilage located at the base of the tongue that covers the larynx during swallowing. Its main function is to prevent food or liquid from entering the windpipe and causing choking or aspiration. When we swallow, the epiglottis closes off the entrance to the larynx, directing the food or liquid down the esophagus and into the stomach.
7.
What is the function of the serous fluid between the pleural membranes?
Correct Answer
A. Prevent friction
Explanation
The serous fluid between the pleural membranes functions to prevent friction. The pleural membranes are thin, delicate layers that surround the lungs and line the chest cavity. As the lungs expand and contract during breathing, the pleural membranes slide against each other. The serous fluid acts as a lubricant, reducing friction and allowing the membranes to glide smoothly. This helps to prevent discomfort and damage to the delicate tissues of the lungs and chest cavity.
8.
How do cilia function as a protective mechanism in the respiratory system?
Correct Answer
C. Prevents respiratory infections
Explanation
Cilia function as a protective mechanism in the respiratory system by preventing respiratory infections. Cilia are tiny hair-like structures that line the respiratory tract. They constantly beat in coordinated waves, moving mucus and any trapped particles or pathogens out of the respiratory system. This helps to prevent the entry of harmful substances into the lungs and reduces the risk of respiratory infections.
9.
Which blood cell has the privilege of carrying oxygen in the body?
Correct Answer
D. RBC (Red blood cell)
Explanation
Red blood cells, or RBCs, have the privilege of carrying oxygen in the body. They contain a protein called hemoglobin, which binds to oxygen in the lungs and transports it to the body's tissues. RBCs are specialized for oxygen transport, as they lack a nucleus and other organelles to make space for more hemoglobin. This allows them to carry a large amount of oxygen and deliver it efficiently to cells throughout the body.
10.
What is the normal respiratory rate for the healthy adult?
Correct Answer
B. 12-20
Explanation
The normal respiratory rate for a healthy adult is typically between 12 and 20 breaths per minute. This range is considered normal because it reflects the average rate at which a healthy adult breathes at rest. Respiratory rate can vary depending on factors such as age, physical activity, and overall health. However, a rate below 12 or above 20 breaths per minute may indicate an underlying health condition and should be evaluated by a healthcare professional.