Hormones Flashcards
Hormones
Chemicals carried through bloodstream - other parts of body.
-act on target tissues > produce physiological effects
Pheromones
Released outside body to affect other individuals of same species - urine
Allomones
Released to affect behavior of another species
Endocrine communication
Released into bloodstream to selectively affect distant target organs
Synaptic communication
Released chemical signal diffuses across synaptic cleft > change in post-synaptic membrane
Peptide & Amine hormone receptors
bind to receptor proteins on surface of target cell
-activates second messengers inside cell
Steroid hormone receptors
pass into cell
Oxytocin in voles
In females - help bond to mates (pair bonds), vasopressin in moles
Negative Feedback systems
Hormones released, activates target cells & causes bio response, feeds back & inhibits further secretion
Gene vs. DNA vs. Chromosomes
Gene - pieces of DNA hold info to build 1 type of protein
DNA - carries instructions to make proteins, single strand holds info to make many proteins
Chromosomes: strands of coiled DNA - hold info to build proteins
SRY Gene
presence = tests
absence = ovaries
Anisogametic
> 2 sizes of gametes
Isogametic
only 1 size gamete
Monecious
2 sizes of gamete but made by all (intersex)
Asexual production
No fusion of gametes
