When the muscles on the posterior side of the head pull on the skull and oppose the tendency of the head to tip anteriorly, one has an example of a ________ lever.
A. third-class
B. first-class
C. second-class
Answer: B
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The chorion ________ and the amnion ________.
A. projects into the endometrium and helps form the placenta; is a membrane that encircles a developing embryo B. is the site from which primary germ layers develop; is the site from which secondary germ layers develop C. is the part of the blastocyst that is not the inner cell mass; is the inner cell mass D. is the outer protective membrane around the embryo; is the site where an embryo is implanted into the uterus
Which of the following is formed by intramembranous ossification?
A) roof of the skull B) carpal bones C) femur D) clavicle E) the roof of the skull and the clavicle
By the second month of development, within the umbilical cord there are ________ umbilical vein(s) and ________ umbilical artery(ies).
A. two; one B. one; two C. one; one D. two; two E. two; three
Anatomists around the world adhere to a lexicon of standard international terms, which stipulates both Latin names and accepted English equivalents.
Answer the following statement true (T) or false (F)