Which of the following statements about the placenta is false?
a. The mother's body disposes of wastes for both mother and child
b. The placenta begins forming early in pregnancy.
c. Maternal and fetal blood mix in the placenta.
d. Embryonic blood vessels exchange substances with maternal blood.
c
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Cells save energy and materials by using many of the same enzymes for both ________ and ________.
What will be an ideal response?
The __________ gland produces hormones and is the
site where __________ (a kind of white blood cell) mature. Fill in the blank(s) with the appropriate word(s).
The condition occurring when an organism has a 2n + 1 chromosome composition is known as
a. monosomy. b. trisomy. c. diploid. d. haploid. e. both trisomy and haploid.
How are neurons structurally adapted to chemically transmit impulses to neighboring neurons?
A) They have numerous nodes of Ranvier. B) They have numerous dendrites. C) They have Schwann cells that surround axons. D) None of the listed responses is correct E) Axon terminals contain neurotransmitters within synaptic vesicles.