Respiratory system

The actual gas exchange with the blood occurs in the 

• bronchi

• bronchioles

• alveoli

• ventricles

Answer explanation

The actual gas exchange with the blood occurs in the alveoli, which are tiny air sacs in the lungs. They provide a large surface area for oxygen and carbon dioxide to diffuse between the air and the bloodstream.

Inhalation brings in fresh ________ and exhalation removes ________.

• cabon dioxide, oxygen

• oxygen, nitrogen

• oxygen, carbon dioxide

• nitrogen, carbon dioxide

Answer explanation

Inhalation brings in fresh oxygen, which is essential for cellular respiration, while exhalation removes carbon dioxide, a waste product of this process. Thus, the correct answer is oxygen, carbon dioxide.

The respiratory system, in conjunction with the cardiovascular system, delivers ________ to the cells of the body.

• oxygen

• nutrients

• carbon dioxide

• sodium

Answer explanation

The respiratory system is responsible for taking in oxygen from the air, which is then transported by the cardiovascular system to the cells of the body for energy production. Thus, the correct answer is oxygen.

What is tube that is also known as your wind pipe?

• esophogus

• bronchi

• trachea

• alveoli

Answer explanation

The tube known as your windpipe is called the trachea. It connects the throat to the lungs, allowing air to pass through. The other options, such as esophagus, bronchi, and alveoli, serve different functions in the respiratory and digestive systems.

What are the main organs of the respiratory system?

• muscles

• lungs

• nose and mouth

• bronchi

Answer explanation

The lungs are the primary organs of the respiratory system, responsible for gas exchange. While the nose, mouth, and bronchi are involved in the process, the lungs are the main organs that facilitate breathing.

What is the dome-shaped muscle that works with your lungs?

• biceps

• triceps

• diaphragm

• rectus abdominus

Answer explanation

The diaphragm is a dome-shaped muscle located beneath the lungs. It plays a crucial role in breathing by contracting and relaxing, which helps to expand and compress the lungs, facilitating airflow.

What is the main function of the respiratory system?

• to provide oxygen and remove carbon dioxide from the body

• to bring oxygen to the body

• to make red blood cells

• to remove oxygen from the body and deliver carbon dioxide

Answer explanation

The main function of the respiratory system is to provide oxygen and remove carbon dioxide from the body, ensuring proper gas exchange for cellular respiration, which is essential for sustaining life.

Which system works closely with the respiratory system?

• skeletal system

• circulatory system

• excretory system

• digestive system

Answer explanation

The circulatory system works closely with the respiratory system by transporting oxygen from the lungs to the body's cells and returning carbon dioxide to the lungs for exhalation, making it essential for respiration.

The air sacs that are covered with capillaries where gas exchange takes place

• bronchioles

• pulmonary vein

• pulmonary artey

• alveoli

Answer explanation

The alveoli are tiny air sacs in the lungs surrounded by capillaries, where the exchange of oxygen and carbon dioxide occurs. This makes them the correct answer for the location of gas exchange.

Tiny tubes that branch off of bronchi

• capillaries

• alveoli

• bronchioles

• pluera

Answer explanation

Bronchioles are the tiny tubes that branch off the bronchi, leading to the alveoli where gas exchange occurs. Capillaries are small blood vessels, and pleura refers to the membranes surrounding the lungs.