Answer: B. The release of calcium ions causes myosin and actin to attach to each other. This statement best describes a cause and it's effects that occur during the process of muscle contraction.
Muscle contraction can be explained by sliding filament theory.
1. Activation of muscles: the motor nerve generates an impulse to transfer signals from neurons to neuromuscular junction. This stimulates sarcoplasmic reticulum to release calcium into the muscle cells.
2.Contraction of muscles: calcium in the muscle cells binds with troponin causes actin and myosin to bind. Actin and myosin in the muscle binds and contract by utilizing ATP as a source of energy.
Answer:
Carbon Dioxide Emissions: Human Sources
<h2>Human activities such as the burning of oil, coal and gas, as well as deforestation are the primary cause of the increased carbon dioxide concentrations in the atmosphere.</h2>
The Brain waves associated with REM sleep are most similar to those of stage 1 sleep.
The first Rapid Eye Movement sleep stage lasts around 10 minutes and usually happens after having asleep at least 90 minutes. At this stage the eye moves rapidly in all directions during Rapid Eye Movement sleep. Additionally during this stage powerful dreams usually happen.
Answer:
Evaporation
Explanation:
The water will gradually evaporate(the process of a liquid becoming a gas).If the temperature reaches the water's boiling point, it will quickly evaporate and form steam.
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