During implantation, the trophoblast divides into a deep layer called the ________, which is composed of individual cells.
A. cytotrophoblast
B. amnion
C. embryoblast
D. syncytiotrophoblast
E. chorion
Answer: A
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A lack of intrinsic factor, leading to a deficiency of vitamin B12 and large pale cells called macrocytes, is characteristic of ________.
A) aplastic anemia B) polycythemia C) pernicious anemia D) sickle-cell anemia
Matching
A) Homozygous B) Sex chromosomes C) Recessive D) Genotype 1) Actual genetic makeup. 2) A chromosome pair that may be very different in size. 3) Genes not expressed unless they are present in homozygous condition. 4) Situation in which an individual has identical alleles for a particular trait.
Which of the following is not true of the atria?
a. receive blood from arteries returning to the heart b. are called receiving chambers c. have thinner walls than ventricles d. all of the above are true
For graded potentials, the magnitude of triggering is coded for in frequency rather than amplitude of depolarizations
Indicate whether the statement is true or false