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Bronchoconstriction happens when smooth muscles around the lungs constrict and block the flow of air in the lungs. This can happen because of internal factors due to diseases such as asthma and inflammatory diseases, but it can also be caused by external factors such as changes in humidity, temperature, and pressure of the air and also excessive workout.
False, it has to be related to the subject study.
Answer:
see the answer below
Explanation:
<em>The cells of the brain and spinal cord are irreplaceable because these cells do not undergo cell divisions like some other cells of the body.</em>
<u>Through cell division of the vegetative cells, damaged cells of the body are replaced by new cells. The cells of the brain and spinal cords however are special cells that will not divide under ordinary conditions. Hence, when there is any form of damage, there are no new cells to replace the damaged cells.</u>