The correct answer is option They need more oxygen to function, so gas exchange needs to increase.
As the person starts a physical exercise, the workload of the muscles increase, which produces a higher demand of ATP. In order to produce ATP, the mitochondria require more oxygen and glucose to generate the ATP molecules, as a result, the demand for the oxygen is increased. Due to increase in oxygen demand, the lungs do more gaseous exchange, so that the demand of the oxygen can be fulfilled.
The sarcomere will have uncontrolled muscle contractions.
Troponin blocks myosin-binding sites in the tropomyosin of the actin. If the troponin is damages, the myosin-binding sites will be exposed and myosin heads (of the myosin fiber) will be able to form cross-bridges with the actin even when not required.
Explanation:
This means the sarcomere will contract even when not required or expected hence resulting in symptoms like muscle spasms. Usually, troponin molecules exposes the myosin-binding sites on the tropomyosin upon binding of Ca²⁺ ions. These Ca²⁺ are usually released by the sarcoplasmic reticulum upon impulse from the inverted nerve.
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Answer is the first option, Fossil fuels release carbon dioxid, a greenhouse gas, as they burn.