4. checkmate. when the minimal amount of urinals are used in a boys bathroom, but you cannot use one without breaking guy code. 5 urinals, people at urinals 2 and 4, so you cannot use a urinal without being next to someone.
1 When blood concentrations of thyroid hormones increase above a certain threshold, TRH-secreting neurons in the hypothalamus are inhibited and stop secreting TRH. 2  This is an example of negative feedback.
Page 883 in Mader (see fig. 49.2) does state that steroid hormones regulate gene expression (protein production) and that protein hormones activate particular chemical reaction series (an example is the protein hormone glucagon that activates the chemical reactions converting glycogen to glucose).