Describe how lung ventilation and heart rate can be increased or decreases

Describe how lung ventilation and heart rate can be increased or decreases

• increased tissue respiration causes accumulation of carbon dioxides and depletion of oxygen
• the high carbon dioxide content in blood is detected by carotid body and aortic bodies.
• These send impulses to and stimulate the respiratory centre in medulla oblongata
• The respiratory centre send impulses to the intercostal muscle and diaphragm muscles to contract more vigorously to increase ventilation.
• When there is enough oxygen and less carbon dioxide the aortic and carotid bodies are less stimulated
• The frequency and depth of contraction of intercostal and diaphragm muscles reduce. This reduces the ventilation rate.

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