$CATEGORY: Science - Khan Academy/6.Life Processes/6.Life Processes--Respiration

//Multiple Choice

The sternum is\: {
    ~A bone in the forearm
    =A bone in the chest that connects to the ribs
    ~A part of the spine
    ~A cartilage in the neck
}

How many alveoli are present in the lungs? {
    ~100 million
    ~300 million
    =500 million
    ~700 million
}

Which of the following events occurs during inhalation? {
    ~Muscles contract
    ~Alveoli are stretched open
    =Both (a) and (b)
    ~None of the above
}

What happens to lung volume during inhalation? {
    ~It decreases
    ~It stays the same
    =It increases
    ~None of the above
}

During exhalation, the diaphragm ________. {
    ~Moves downward
    ~Stays the same
    ~Move Sideways
    =Moves upward
}

Which of the following muscles helps in expanding the chest cavity during inhalation? {
    =Intercostal muscles
    ~Abdominal muscles
    ~Gluteal muscles
    ~All of the above
}

The process of inhalation is also known as ________. {
    ~Expiration
    ~Exhalation
    =Inspiration
    ~None of the above
}

//True or False

Muscles are located between the ribs. {T}

The intercostal muscles relax during deep breathing. {F}

The elastin protein functions similarly to a rubber band. {T}

The alveoli recoil during inhalation. {F}

The process of inhalation requires energy and is considered active. {T}

During inhalation, the lung volume decreases. {F}

The diaphragm moves downward during inhalation to increase lung volume. {T}

Exhalation involves the relaxation of the diaphragm. {T}


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