Breathing is regulated by

Answer 1

because they do

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The regulation of breathing is controlled by the neurons in the medulla. Under most conditions, breathing rate is maintained involuntarily by the medulla. This system is very flexible and it is possible for breathing rate to be controlled voluntarily. Breathing is accomplished by the medulla firing action potentials at a rhythmical rate. These action potentials cause the muscles in the diaphragm and theintercostal muscles to contract. The rate and depth of breathing is dependent upon the medulla's ability to detect pH levels in the blood. By detecting changes in pH, the medulla is indirectly determining the amount of carbon dioxide in the blood. The following reaction demonstrates the relationship between carbon dioxide levels and pH.

CO2 + H2O <=> H2CO3 <=> (H+) + (HCO-)

At low pH levels (high [H+]), the respiratory center in the medulla becomes stimulated and results in an increase in the rate and depth of breathing. However when pH is high, breathing becomes slower and shallower due to a decrease in nervous stimulation. For instance in hyperventilation pH levels are so high that there is a temporary cessation of breathing (apnea).

Answer 2

Our human bodies usually regulate temperature by sweating.

Sweating causes some water form a layer above the skin , more heat energy need to be evaporate the water , so in case of that , heat energy in body will decrease . Hence , we will feel more cool when we sweat and rest for a while .

Answer 3

Regulation of respiration is controlled by the nervous mechanism and chemical mechanism. The nervous mechanism is the main one and it involves use of afferent and efferent nerves of the respiratory centers.

Answer 4

CO2 and O2 concentration and pH-level sensors.

Answer 5

the receptors in the brain and cardiovascular system

Answer 6

Breathing is controlled by muscles.

Answer 7

Your diaphragm and cell respiration

Answer 8

with the help of exercise.