Parietal cells within the stomach lining secrete hydrochloric acid that lowers the pH of the stomach. A low pH (1.5 to 2) activates pepsin. Acetylcholine, gastrin, and histamine stimulate the proton pump in parietal cells to release hydrogen ions and decrease pH.
She was an English chemist and x ray crystallographer who made contributions to the understanding of the molecular structures of DNA,RNS,viruses,coal, and graphite<span />
Answer:
Primary active transport directly uses a source of chemical energy (e.g., ATP) to move molecules across a membrane against their gradient.
Answer:
Eugleas create their own food through photosnthsis, the process of absorbing sunlight to synthesize foods from carbon dioxide and water. An eyespot at the front end of the euglena detects light I belive
Explanation:
Answer:
B.
Explanation:
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