Its efferents go to the motor cortex, to help coordinate its function. It also receives input from the limbic system that regulates emotion. The controversial abortion drug RU486 induces abortion in early stages of pregnancy. RU486 is a progesterone antagonist, i.e., it blocks binding of the steroid hormone progesterone to its receptor and thereby blocks progesterone-dependent functions. Based on your knowledge of the hormonal regulation of the female reproductive system, give a more complete explanation of why RU486 leads to loss of the fetus.
Hormones help the body manage stress.
Describe three different hormones that increase after stress and that help manage stress, giving their tissue of origin and the extracellular chemical signal that most directly triggers their release. CRF causes release of ACTH from the pituitary. Nitrogen is excreted by animals as either ammonia, urea or uric acid. Pick two of these nitrogen excretion forms and for each tell one type of animal that uses that nitrogen excretion chemical and a special advantage of that chemical for excreting nitrogen in the environment of the animal. Aquatic animals excrete nitrogen as ammonia because ammonia has high solubility in water, easily passes through membranes into water where its high rate of dilution prevents build up of this toxic compound.