Answer:
1. spontaneously
2. resting potential
3. action potentials
4. pacemaker potentials
5. K+
6. Na+
7. into
8. Ca+
Explanation:
Pacemaker cells (also known as sinoatrial node cells) are cells that generate rhythmic impulses and set the pace for blood pumping in the heart. These cells have the ability to rhythmically depolarize and initiate action potentials. In pacemaker cells, Ca2+ and Na+ levels are higher in the extracellular environment, while K+ concentration is higher intracellularly. The pacemaker action potentials have three phases: 1-depolarization, where membrane potential reaches -40 mV and voltage-gated Ca2+ channels open, 2-repolarization, where voltage-gated Ca2+ channels close and voltage-gated K+ channels open, and finally 3-gradual depolarization, which is caused by the slow influx of Na+ ions.
Answer: A) Photosynthesis
Photosynthesis:<em> </em><em><u>The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water</u></em><em>. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.</em>
Cellular Respiration:<em> </em><u><em>Is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate</em></u><em> (ATP), and then release waste products.</em>
Decomposition:<em> Is the process by which organic substances are</em><u><em> broken down into simpler organic matter</em></u><em>. The process is a part of the nutrient cycle and is essential for recycling the finite matter that occupies physical space in the biosphere. Bodies of living organisms begin to decompose shortly after death.</em>
Burning Fossil Fuels:<em> </em><u><em>is a fuel formed by natural processes,</em></u><em> such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis. Such organisms and their resulting fossil fuels typically have an age of millions of years, and sometimes more than 650 million years.</em>
(<em>Extra</em>)>Carbon moves from the atmosphere to plants. In the atmosphere, carbon is attached to oxygen in a gas called carbon dioxide (CO2). Through the process of <em>photosynthesis</em>, carbon dioxide is pulled from the air to produce food made from carbon for plant growth. Carbon moves from plants to animals.
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