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(i) Explain the term homeostasis - Leaving Cert Biology - Question a - 2017
Question a
(i) Explain the term homeostasis. (ii) Why is homeostasis important in the human body? (iii) Describe in detail the process of inhalation. (iv) Name a human breathin... show full transcript
Worked Solution & Example Answer:(i) Explain the term homeostasis - Leaving Cert Biology - Question a - 2017
Step 1
Step 2
Why is homeostasis important in the human body?
Answer
Homeostasis is crucial because it allows biological processes to occur efficiently. It maintains normal metabolic activity, ensuring that reactions occur at the appropriate rates and that conditions are suitable for enzymes to function, ultimately supporting overall health.
Step 3
Describe in detail the process of inhalation.
Answer
Inhalation begins with the brain sending signals that increase the levels of carbon dioxide in the blood. In response, the diaphragm contracts and flattens, while the intercostal muscles contract to raise the rib cage. This increases the volume of the thoracic cavity, causing a decrease in pressure inside the thorax (or lungs). As the pressure falls, air is drawn into the lungs, filling the alveoli where gas exchange occurs.
Step 5
State a cause and a treatment for the breathing disorder referred to in part (iv).
Answer
A cause of asthma can be the constriction of the bronchioles due to allergens such as dust. A common treatment is to avoid exposure to these allergens or use an inhaler to manage symptoms effectively.