Human Respiration

Respiration is a biochemical process, which involves breathing and oxidation of food with the release of energy.It provides oxygen to all the tissues and cells of the body.

Breathing, gaseous exchange, tissue respiration and cellular respiration are various steps of respiration.

Respiratory tract consists of nose, pharynx, larynx, epiglottis, trachea, bronchi, alveoli and lungs.

Epiglottis is a cartilaginous flap that covers the trachea to prevent food or water from entering the respiratory tract.

Pharynx is the part of alimentary canal. It is a funnel-shaped channel, which is common for air and food.

Alveoli are the small balloon-like structures present in the lungs. They provide large surface area for gas exchange.

Respiratory cycle comprise of inspiration and expiration with a short pause in between.

Lung capacity is the volume of air that a lung can withhold in different phases of respiratory cycle.The average lung capacity of an adult is 6 litres of air.

Hypoxia is a condition, in which haemoglobin is not able to bind with sufficient oxygen, resulting in less supply of oxygen to body parts.

Asphyxiation is a condition in which body is severely deprived of oxygen supply.

Emphysema arises when the lungs do not allowefficient gas exchange.

Coronary Heart Diseaseis a medical condition,in which blood circulation does not deliver oxygen to the tissue efficiently.

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  • Q1

    When inhaled air enters the lungs,

    Marks:1
    Answer:

    diaphragm moves down.

    Explanation:
    During inhalation, the inhaled air occupies space in the lungs, due to which, the ribs move towards outside and diaphragm (a muscular sheet present horizontally below the lungs) moves down. During exhalation, reverse condition takes place i.e. ribs move towards inside and diaphragm moves up.
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  • Q2

    The process of breakdown of food in the cell with the release of energy is called

    Marks:1
    Answer:

    respiration.

    Explanation:
    All living organisms respire to get energy from food for performing various functions. The food has stored energy, which is released during respiration. Respiration is a very essential process for the survival of living-organisms.
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  • Q3

    Breathing is a part of respiration, during which exchange of gases occurs by two processes. They are

    Marks:1
    Answer:

    inhalation and exhalation.

    Explanation:
    The taking in of air rich in oxygen is called inhalation and giving out air rich in carbon-dioxide is called exhalation. Breathing comprises of both inhalation and exhalation.
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  • Q4

    The part of the nasal cavity where minute unwanted particles are trapped is

    Marks:1
    Answer:

    hair.

    Explanation:
    Air is a mixture of various gases and many minute unwanted particles present in it. When any such particle is inhaled, it gets trapped in the hair present in our nasal cavity. Sometimes, instead of getting trapped by hair, they reach the lining of the nasal cavity and causes irritation.
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  • Q5

    Breathing is a part of

    Marks:1
    Answer:

    respiration.

    Explanation:
    Breathing is a part of respiration, during which exchange of gasses occurs by inhalation and exhalation.
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