Biologically Important Peptides
Start with the big picture
The lesson surveys peptides with varied structures and functions. Glutathione is a tripeptide linked to intracellular antioxidant activity, conjugation-based detoxification, and preservation of hemoglobin Fe²⁺. Insulin and glucagon have opposing effects on blood glucose, while vasopressin and oxytocin are cyclic nine-residue peptides with distinct actions. Other examples connect peptide hormones to blood pressure and kidney function, digestion, pain, and calcium regulation. The topic also covers inhibitory peptides such as somatostatin and endogenous opioid peptides, as well as signaling molecules including substance P. Across these examples, the focus is on recognizing key structural details and relating each peptide to its principal biological role.
What you'll learn
- Identify the structures and principal functions of biologically important peptides.
- Contrast insulin and glucagon in their effects on blood glucose.
- Relate vasopressin and oxytocin structures to their distinct actions.
- Describe peptide roles in digestion, blood pressure, pain, and mineral regulation.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
