Progenitor cells form
A) all the different types of blood cells.
B) stem cells.
C) hematopoietic stem cells.
D) only specific types of blood cells.
E) None of the answers are correct.
D) only specific types of blood cells.
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The pre-embryonic period ends when
A. a morula is formed. B. the zygote undergoes cleavage. C. the blastocyst implants in the uterus. D. the morula develops a trophoblast.
) All chemical reactions are theoretically reversible. Comment on this statement.
What will be an ideal response?
Which of the following is not a component of the conducting zone structures?
A. Primary bronchi B. Tertiary bronchi C. Alveolar duct D. Terminal bronchiole
The diameter of bronchioles can change because their walls contain
A. smooth muscle. B. skeletal muscle. C. fibrous cartilage. D. hyaline cartilage. E. elastic cartilage.