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Draw a large diagram of the human breathing system - Leaving Cert Biology - Question b - 2007
Question b
Draw a large diagram of the human breathing system. Label the trachea, bronchus and lung. State the function of the following: epiglottis, larynx. Describe briefly... show full transcript
Worked Solution & Example Answer:Draw a large diagram of the human breathing system - Leaving Cert Biology - Question b - 2007
Step 1
Draw a large diagram of the human breathing system. Label the trachea, bronchus and lung.
Answer
To draw the human breathing system, start with a vertical trachea that branches into the left and right bronchi. Each bronchus leads to a lung, which should be depicted as two large, spongy structures on either side of the trachea. Ensure that the diagram includes the diaphragm at the base, the larynx at the top of the trachea, and additional structures such as alveoli. Label the trachea, bronchus, and lung clearly.
Step 2
Step 3
Step 4
Describe briefly the role of the diaphragm and intercostal muscles in inhalation.
Answer
During inhalation, the diaphragm contracts and moves downward, increasing the volume of the thoracic cavity. Simultaneously, the intercostal muscles contract, raising the rib cage and further expanding the chest cavity. This increase in volume leads to a decrease in thoracic air pressure, allowing air to flow into the lungs.