Stomach: Acid Environment and Pepsin
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
The stomach digests protein in a highly acidic environment, pH 1.5 to 2.5, where pepsin — activated from inactive pepsinogen by hydrochloric acid — cleaves proteins into peptides.
Show
Parietal cells secrete the hydrogen and chloride ions that combine into the stomach's hydrochloric acid.
Watch for
Pepsin is made inactive as pepsinogen specifically to protect the stomach's own lining from digesting itself.