Umbilical arteries:
A. deliver oxygen and nutrient-rich blood from the mother to the placenta.
B. deliver oxygen and nutrient-rich blood from the fetus to the placenta.
C. carry blood with low oxygen and high metabolic wastes away from the fetus to the placenta.
D. carry highly oxygenated blood from the placenta to the fetus.
E. carry blood with low oxygen and high metabolic wastes from the placenta to the mother's circulation.
C
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Fill in the blank with correct word.
Caffeine and related stimulants exert their effects by
A) inhibiting a specific neuromodulator. B) inhibiting a specific neurotransmitter. C) mimicking a specific neuromodulator. D) mimicking a specific neurotransmitter.
‘Control of salt balance in humans is accomplished primarily by control of salt intake via a well-developed salt hunger
Indicate whether the statement is true or false
Myelin has a high ______ concentration.
a. protein b. nucleic acid c. lipid d. carbohydrate