That GPCRs are coupled to a GTP binding protein that is made of the parts of three animals

That GPCRs are coupled to a GTP binding protein that consists of three sub-units

That GPCRs can exert their effects in three different ways: ion channels, 2nd messengers and cyclic AMP

That the GPCR produces effects by acting on molecules such as adenylate cyclase (AC) or phospholipase C (PLC), or direct effects by regulating ion channel or kinase function.

That the ligand for the GPCR can bind to one of three sites on the GPCR

Free floating proteins that bind to steroid hormone receptors to prevent them being degraded by cellular enzymes

Proteins tethered to the cytoskeleton to hold steroid hormone receptors in place

Free floating proteins that carry steroid hormone receptors through the cell

Tethered proteins that hold the steroid hormones in place for an influx of Ca⁺⁺ when the cell is depolarized

Docking proteins that hold vesicles of steroid hormones in place for maximum biding to free floating receptors

C

A beta

B

A alpha

A gamma

Eccentric

Concentric

Isotonic

Isometric

Isovelocity