From the ejaculatory duct, sperm cells travel directly into the:
A) seminal vesicle.
B) prostatic part of the urethra.
C) spongy part of the urethra.
D) membranous part of the urethra.
E) ductus deferens.
Ans: B) prostatic part of the urethra.
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The region known as the primitive streak is the site of
A) migration of mesodermal cells to form the endoderm. B) endoderm formation. C) ectoderm formation. D) migration of ectodermal cells to form the mesoderm. E) amnion formation.
The neurotransmitter most likely produced when a person uses a drug that creates a sense
of well-being is A) dopamine. B) substance Q. C) enkephalin. D) glutamic acid.
A local ______ (increase or decrease?) in CO2 within alveoli cause constriction of the airways leading to those alveoli
Fill in the blank(s) with correct word
Trace elements such as zinc and manganese are found in minute quantities in the body but do not serve any known function.
Answer the following statement true (T) or false (F)