Drugs that lead to birth defects in the formation of the limbs are most damaging when the conceptus is exposed to them during weeks
A. 1-2 of development, before the placenta is fully formed.
B. 4-8 of development, when limbs are undergoing peak development.
C. 12-16 of development, when limbs have formed but are not fully mature.
D. 24-28 of development, when plasticity of surrounding tissues has been lost.
B
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Which is the correct sequence for differentiation of a red blood cell?
A. Hematopoietic stem cell, erythroblast, reticulocyte, erythrocyte B. Hematopoietic stem cell, erythroblast, erythrocyte, reticulocyte C. Hematopoietic stem cell, hemocytoblast, erythrocyte, erythroblast D. Hematopoietic stem cell, erythrocyte, hematoblast, erythroblast
A structure known as the corpus luteum secretes
A) testosterone. B) progesterone. C) aldosterone. D) cortisone. E) androstenedione.
Is blood velocity faster or slower in the capillaries compared to the arteres? Explain.
What will be an ideal response?
Which of the following correctly describes passive transport?
A. Transport of materials across the cell membrane without the use of energy B. Transport of materials across the cell membrane with the use of energy C. Transport of materials across the cell membrane D. Transport of materials across the cell membrane up the concentration gradient