Life Processes

  • Question 101
    CBSEENSC10011801

    Differentiate between:
    (i) Inhalation and Exhalation

    Solution

    Inhalation

    Exhalation

    1. It is the process of taking air into the lungs.

    1. It is the process of giving out the air from the lungs.

    2. The external intercostal muscles contract, raising the ribs forward and upwards.

    2. The internal intercostal muscles contract and the ribs take their normal position.

    3. The muscles of the diaphragm contract and make it straight.

    3. The muscles of the diaphragm relax and it comes to its original dome shaped position.

    4. The abdominal muscles relax and allow compression of the abdominal organs.

    4. The abdominal muscles contract and the diaphragm pushes upward.

    Question 102
    CBSEENSC10011802

    With the help of a ray diagram, list all parts in sequences through which atmospheric air reaches the last part of the our lungs.

    Solution
    External nostrils → Nasal cavity → Nasopharynx → Larynx → Trachea → Bronchi → Branchioles → Aveolar duct → Alveolus or alveolar sac.
    Question 103
    CBSEENSC10011803

    Draw a labelled diagram to show the path of air from Trachea to structure where exchange of gases take place between air and blood in the lungs.

    Solution

    Diagram showing organs involved in exchange of gases i.e. alveoli and network of capillaries. 

    Question 104
    CBSEENSC10011804

    What are the conditions essential for effective respiration?

    Solution

    The conditions essential for effective respiration are:
    1. Presence of thin and permeable respiratory surface thin and permeable respiratory surfaces.
    2. Rich supply of blood to the respiratory surface.
    3. Passage for bringing oxygen to the respiratory surface and removing CO2 through the same passage.
    4. Moist respiratory surface.
    5. Presence of a circulatory system.
     6. Presence of a respiratory pigment to carry out the respiratory gases (CO2 and O2) .

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