Which of the following bones must the olfactory neurons pass through to enter the central nervous system (CNS)?
What will be an ideal response?What will be an ideal response?
Ethmoid Bone
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Which of following facial bones is a single (unpaired) bone in the human skull?
a) maxilla b) nasal c) lacrimal d) mandible e) zygomatic
You and your lab partners in a human anatomy course have just removed the intestines from an adult cadaver, and cut away connective tissues as necessary to uncoil the intestines into a straight line that could be measured. Your professor told you that the intestinal tract of an adult of this size and gender is typically about 13 ft. Your measurement is 22 ft. One of the lab partners insists that
everything is smaller in preserved cadavers due to dehydration. Address this suggestion, and propose some other explanations for the difference. What will be an ideal response?
Hydatid mole is a type of pregnancy that, without medical intervention, frequently results in the death of the mother. The hydatid mole is thought to result most often from an abnormality in fertilization, such that the egg has two copies of paternal chromosomes, and no maternal DNA. A fetus fails to develop; instead there is rapidly growing chorionic tissue in the placenta, which secretes hCG
and thus leads to a positive pregnancy test and outward signs of pregnancy. The first clue to the obstetrician that the pregnancy is abnormal is often the lack of a heartbeat in the first trimester. A. What is the genotype of the hydatid mole tissue? From the genotype alone, would most science -literate students predict that a normal embryo would form? Explain, indicating what this suggests about maternal and paternal contributions to the embryo. B. The most common cause of molar pregnancy-related maternal death is a type of cancer called choriocarcinoma, with the hydatid mole being the source and thus resembling a tumor. What characteristic of tumors leads to cancer? C. While these pregnancies often spontaneously abort, some women may elect to terminate a hydatid molar pregnancy. Is this a special case of elective abortion or is it tumor-removal? Explain.
Define corticospinal tracts
A) Corticospinal tracts are ascending tracts that carry information or commands from the sensory nuclei in the brainstem to the cerebral cortex. B) Corticospinal tracts are descending tracts that carry information or commands from the cerebral cortex to motor nuclei in the brainstem. C) Corticospinal tracts are ascending tracts that carry sensory information from the anterior gray horns of the spinal cord to the cerebral cortex. D) Corticospinal tracts are descending tracts that carry motor commands from the cerebral cortex to the anterior gray horns of the spinal cord. E) Corticospinal tracts are ascending tracts that receive sensory information from the internal ear about the position and movement of the head.