Test: Human Anatomy and Physiology

1.

How do steroid hormones affect their target organs?

They travel to target organs by floating freely in the bloodstream

They bind to receptors on the cell membrane in order to be activated, allowing them to directly enter the cell

They attach to protein receptors on the cell membrane

They enter the nucleus and affect the transcription of genes

They use a second messenger system to elicit an effect on target cells

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