The three main classes of chemicals that act as hormones are __________, amines, and steroids
Fill in the blank with the correct word.
Answer: Peptides
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Which of the following is a remnant of fetal circulation?
A. Ductus venosus B. Ligamentum venosum C. Ductus arteriosus D. Aortic sac E. Foramen ovale
Bone cells form concentric circles around longitudinal tubes called
A) osteons. B) lacunae. C) central canals. D) canaliculi.
A chemical produced in a cell that activates specific processes in response to a hormone interaction with a membrane-bound receptor is referred to as a(n) _____
A. hormone response element B. transcription factor C. messenger RNA D. intracellular mediator
The ________ group of neurons contains mostly inspiratory neurons. The ________ group of neurons controls muscles used for active expiration and some inspiratory muscles.
Fill in the blank(s) with the appropriate word(s).