I believe it’s true, correct me if i’m wrong
By multiplying the rate constant by the substrate concentration (amount) or by determining reaction velocity (V).
Answer:
to show the function of one organ in the digestive tract in isolation
Parietal cells produce gastric acid (hydrochloric acid) in response to histamine (via H2 receptors), acetylcholine (M3 receptors) and gastrin (gastrin receptors). Parietal cells contain an extensive secretory network (called canaliculi) from which the HCl is secreted by active transport into the stomach.