C. Chemistry Flashcards
what is a hormone?
A class of signalling molecules which regulate physiology and behaviour in organisms.
What is a steroid?
A class of compounds defined by a specific structure of 17 carbon atoms in four rings.
what is a steroid hormone?
A signalling molecule which has a specific structure of 17 carbon atoms in four ring
what are the 2 classes of steroid hormones?
Sex hormones and corticosteroids
what are the two types of corticosteroids?
- Glucocorticoids
- Mineralocorticoids
What are the different types of sex hormones?
- Androgens
- Estrogens
- Progestogens
What are the different types of signalling by hormones?
- Endocrine
- Autocrine
- Paracrine agents/Local mediators
- Intracrine
What is the lifecycle of a hormone?
Synthesis
storage
secretion
transport
recognition
relay
degradation
What is an inverse agonist?
binds to receptor and induces an opposite response to agonist
what is a selective receptor modulator?
molecule that binds to receptors but have different effects in different tissues
what is the role of cholesterol?
- regulates fluidity of cell membranes
- biosynthetic precursor for steroid hormones, Vit D and bile acids
