what is the stimulus and response When a human increases physical activity, the amount of fuel burned in its cells also increase
s, which in turn increases the concentration of dissolved CO2 in the blood. The CO2 reacts with water in the blood to make a weak acid, which lowers the pH of the blood. Sensory cells in the medulla of the brain register this drop in pH and send signals to the diaphragm and heart to increase respiration. This will clear the CO2 from the bloodstream.
The stimulus and response when a human increases his/her physical activity
<h3>What is stimulus?</h3>
A stimulus is a detectable change in the physical or chemical structure of an organism's internal or external environment.
The ability of an organism or organ to detect external stimuli, so that an appropriate reaction or response can be made, is called sensitivity
When a human increases physical activity, the amount of fuel burned in its cells also increases, which in turn increases the concentration of dissolved CO2 in the blood. The CO2 reacts with water in the blood to make a weak acid, which lowers the pH of the blood.
Without crossing over, each chromosome would be either maternal or paternal, greatly reducing the number of possible genetic combinations, which would greatly reduce the amount of genetic variation between related individuals and within a species
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