WorksheetsLesson No. 6: The Respiratory System
Total questions: 29
Worksheet time: 15mins
According to the text, life without oxygen is measured in what?
minutes
hours
days
weeks
Which statement best describes the function of the respiratory system as presented in the text?
It is the process of gas exchange between the blood and the environment, involving breathing in oxygen and breathing out carbon dioxide through the lungs.
It transports nutrients from the intestines to the bloodstream.
It regulates body temperature through sweat glands.
It produces hormones that control growth.
According to the description of external respiration, which event occurs at the thin walls of the alveoli and capillaries allowing efficient gas exchange with the environment?
Oxygen moves into the blood and carbon dioxide passes into the alveoli
Blood cells generate oxygen for delivery to tissues
Carbon dioxide dissolves into the pleural fluid and is exhaled directly
Oxygen is stored in the bronchioles before entering the blood
Which process is described as oxygen moving from the blood into the body tissues for energy use while carbon dioxide moves from the tissues into the blood to be removed?
Internal respiration
External respiration
Pulmonary ventilation
Cell division
During inspiration, what muscular actions allow air to enter the lungs as the thorax enlarges?
Rib muscles contract lifting the ribs up and out, and the diaphragm flattens
Rib muscles relax pulling the ribs down and in, and the diaphragm domes upward
Only the abdominal muscles contract while the diaphragm remains relaxed
The diaphragm contracts causing the ribs to move down and in
In the airflow pathway to the alveoli for gas exchange, which structure prevents food from entering the airway at the larynx?
Epiglottis
Pharynx
Bronchioles
Pleural membrane
Which structure directly follows the larynx in the described pathway of air entering the lungs?
Trachea
Bronchi
Pharynx
Alveoli
What primarily determines the rate of breathing as stated in the description of the process?
The carbon dioxide level in the blood
The amount of nitrogen inhaled
The oxygen saturation of pleural fluid
The elasticity of the bronchioles
Which statement explains why breathing helps maintain proper acid–base balance?
Carbon dioxide makes the blood more acidic, so ventilation regulates its level
Oxygen increases blood acidity, so exhalation removes excess oxygen
Nitrogen is buffered by hemoglobin, stabilizing pH during breathing
Water vapor neutralizes acids during inspiration
Which structures move trapped dust-laden mucus toward the nose in the respiratory passages?
Cilia
Alveolar sacs
Pleural membranes
Rib cartilages
Which statement best describes expiration as outlined in the process?
It is the passive outflow of air when the muscles relax and the lungs return to their normal shape
It is the active intake of air requiring contraction of rib muscles and flattening of the diaphragm
It is a forced movement of oxygen from blood into tissues for energy use
It is the active pumping of the heart to drive air from the lungs
In the forms of respiration, which term refers to no respiration?
Apnea
Eupnea
Dyspnea
Hyperpnea
In the forms of respiration, which term describes normal quiet respiration?
Eupnea
Apnea
Dyspnea
Polypnea
In the forms of respiration, which term means difficult respiration?
Dyspnea
Hyperpnea
Eupnea
Apnea
In the forms of respiration, which term indicates increased depth or rate of breathing or both?
Hyperpnea
Polypnea
Apnea
Eupnea
In the forms of respiration, which term denotes rapid, shallow breathing?
Polypnea
Hyperpnea
Dyspnea
Eupnea
In the forms of respiration, which term refers to considerable movement of ribs?
Costal/Thoracic breathing
Abdominal/diaphragmatic breathing
Apnea
Eupnea
In the forms of respiration, which term refers to the visible movement of the abdomen?
Abdominal/diaphragmatic breathing
Costal/Thoracic breathing
Dyspnea
Polypnea
Oxygen moves into the blood from the alveoli and binds with hemoglobin to form which compound?
Oxyhemoglobin
Carbaminohemoglobin
Myoglobin–oxygen complex
Carbonic anhydrase
Blood entering the lung capillaries carries carbon dioxide from the tissues. Just before exhalation, into which structure does this carbon dioxide diffuse?
Alveoli
Bronchioles
Pleural cavity
Plasma
In gas transport, hemoglobin associates with oxygen in one location and dissociates in another. Which pairing is correct?
Association in lungs; dissociation in tissues
Association in tissues; dissociation in lungs
Association in bronchi; dissociation in pleural cavity
Association in posterior air sacs; dissociation in anterior air sacs
Birds have no diaphragm and fixed lungs. Which structures expand and contract with chest movements to move air, acting as bellows?
Air sacs
Alveoli
Gizzard
Swim bladder
During the first inhalation in birds’ two‑cycle breathing, where does fresh air go?
Posterior air sacs
Lungs
Anterior air sacs
Trachea only
During the first exhalation in birds’ two‑cycle breathing, what happens to the air?
It flows through the lungs for gas exchange
It returns to posterior air sacs
It is expelled immediately
It bypasses the lungs and goes to the mouth
During the second inhalation in birds’ two‑cycle breathing, the used air moves to which location?
Anterior air sacs
Posterior air sacs
Trachea
Pleural cavity
During the second exhalation in birds’ two‑cycle breathing, what happens to the air?
It is expelled out
It enters the bloodstream
It is stored in posterior air sacs
It recirculates within the lungs
Select all items that are listed as parts of the human respiratory system in this assignment.
Nose/Nasal cavity
Trachea
Bronchi
Lungs
Bronchioles
Choose the correct order that shows the flow of air from inhalation to gas exchange, using the listed parts.
Nose/Nasal cavity → Trachea → Bronchi → Bronchioles → Alveoli
Trachea → Nose/Nasal cavity → Bronchi → Alveoli → Bronchioles
Bronchioles → Nose/Nasal cavity → Trachea → Bronchi → Alveoli
Alveoli → Bronchioles → Bronchi → Trachea → Nose/Nasal cavity
Which statement best explains how oxygen is taken in and how carbon dioxide is removed during breathing?
Oxygen enters through the nose/nasal cavity, travels down the trachea into the bronchi and bronchioles, diffuses into blood at the alveoli, and carbon dioxide diffuses from blood into alveoli to be exhaled.
Oxygen enters the bloodstream directly through the trachea, while carbon dioxide is filtered out by the bronchioles and stored in the diaphragm.
Oxygen is produced in the lungs during inhalation and carbon dioxide is absorbed by the nose/nasal cavity before exhalation.
Oxygen and carbon dioxide exchange occurs in the bronchi, with oxygen leaving the body during exhalation and carbon dioxide entering during inhalation.
