In the bony fish, all heart chambers are contractile except the
A) Sinus venosus.
B) Atrium.
C) Ventricle.
D) Bulbus arteriosus.
Answer: D
Anatomy & Physiology
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Of the total organic components in bone most of it is
A) collagen. B) keratin. C) keratohyalin. D) elastin. E) actin.
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____________________ is the most important physiological regulator of thyroid hormone secretion
Fill in the blank(s) with correct word
Anatomy & Physiology
Among the invertebrates, ________ have the most complex brains
a. insects b. cephalopods c. annelids d. primates e. echinoderms
Anatomy & Physiology