steroid hormones
FAT
Lipids, or fat.
proteins help control movement of substances through cell membranes.
glucose (sugar) can diffuse through cell membranes
g
Steroid hormones act in the transcriptional level in the nucleus of a cell, due to their ability to travel through cell membranes (hydrophillic). Second messengers are necessary for hormones that cannot penetrate cell membranes (peptides).
receptor molecules on cell membranes receptor molecules on cell membranes
FAT
Lipids, or fat.
b/c steroid and thyroid hormones are fat soluble
proteins help control movement of substances through cell membranes.
because they cannot cross cell membranes
Osmosis
glucose (sugar) can diffuse through cell membranes
Through facilitated diffusion
Hydrophilic proteins.
g