Describe the blastocyst and its role in implantation
What will be an ideal response?
The blastocyst consists of an outer trophoblast and an inner cell mass. Implantation begins about 6 to 9 days after fertilization, when the blastocyst adheres to the uterine lining, or endometrium. The trophoblast cells in contact with the uterine lining divide and form a syncytiotrophoblast that erodes the endometrial lining. Nutrients from uterine glands are absorbed by the syncytiotrophoblast and distributed by diffusion through the cytotrophoblast to the inner cell mass. The blastocyst becomes enclosed within the endometrium by about 10 days after fertilization.
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A light microscope can be used to view very large proteins in a cell.
Answer the following statement true (T) or false (F)
The lymphoid organ that acts like a filter as lymph passes through is
A) appendix. B) tonsils. C) adenoids. D) lymph nodes. E) thymus.
What would you expect a cardiologist to recommend if there was substantial occlusion to a patient's left coronary artery but not the right coronary artery?
A. Because there are multiple alternate paths for blood delivery, the cardiologist would not intervene. B. Because this is a relatively small, unimportant artery, the cardiologist would not intervene. C. Because this is an important artery, and alternate vascular paths are inadequate, the cardiologist would treat the condition. D. Because occlusions require blood to be moved under greater pressure, the cardiologist would prescribe drugs to raise blood pressure.
Building blocks of organic molecules are known as __________.
Fill in the blank(s) with the appropriate word(s).