The discipline known as ________ anatomy examines similarities and differences across species.
Fill in the blank(s) with the appropriate word(s).
comparative
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The first animals to show true tissues were
A) Sponges. B) Placozoans. C) Cnidarians. D) Ctenophores.
What is a major function of the respiratory system?
A) deliver oxygen to the blood and remove carbon dioxide from the body B) produce vitamin D and retain water C) return excess tissue fluid to the cardiovascular system D) digest food and absorb nutrients into the blood
Which hormone stimulates the milk let-down reflex?
A) progesterone B) oxytocin C) estrogen D) relaxin E) GnRH
An area of the heart other than the SA node can become the pacemaker if its contraction rate is faster. This area would be called a(an)
A. interventricular septum. B. intrinsic conduction system. C. ectopic pacemaker. D. heart block.