An elderly resident of a nursing home fell down the front steps and subsequently became disoriented and lethargic. He is brought to the emergency room where an emergency MRI reveals that he has developed hydrocephalus due to a small hemorrhage obstructing the foramina of Monro. The foramina of Monro allow for communication between which of the following?
Answer(s): C
The foramina of Monro form the communication between the lateral ventricles and the third ventricle. The cerebral aqueduct of Sylvius flows caudally into the fourth ventricle (choice A). The lateral foramina of Luschka and the median foramen of Magendie allow for communication between the fourth ventricle and the subarachnoid space. The third ventricle communicates posteriorly with the cerebral aqueduct of Sylvius (choice D). Thus, the third and fourth ventricle communicate by way of this cerebral aqueduct.
Which of the following is the correct sequence of erythroid differentiation?
Answer(s): A
The correct sequence of erythroid differentiation is indicated by choice A. Erythrocyte differentiation in the adult occurs exclusively in the bone marrow and consists of several cellular changes. The cell size decreases: proerythroblast 1419 m in diameter; basophilic erythroblast 1316 m; polychromatophilic erythroblast 1215 m; normoblast, reticulocyte, and mature erythrocyte 810 m. Condensation of the nuclear chromatin and decrease in nuclear diameter occur from the proerythroblast to the normoblast stage with ejection of the nucleus. Subsequent ejection of remaining organelles occurs in the reticulocyte to give rise to the mature erythrocyte. The maturing cells change their staining affinity because the increased hemoglobin in the cytoplasm results in increased acidophilia, whereas the decrease in the ribosome numbers in the cytoplasm results in decreased basophilia.Choices B, C, D, and E are incorrect sequences.
In emphysema, which of the following components of the bronchioles is affected?
Elastic fibers are destroyed in emphysema by elastase. This protease is released by neutrophils recruited by macrophages under abnormal stimulus such as cigarette smoke. The loss of elasticity in the bronchioles and alveolar walls gives rise to emphysema, characterized by chronic airway obstruction. Ciliated cuboidal epithelial (choice A) and Clara (choice B) cells line the terminal bronchioles. Goblet cells (choice D) may be found at the beginning of the bronchioles and squamous type I alveolar epithelial cells line the respiratory bronchioles.
During development, the notochord grows in a cranial direction until it reaches the prechordal plate. This plate is the primordium of the oropharyngeal (or buccopharyngeal) membrane, which, in the embryo, will separate the stomodeum from the foregut. At 26 days of gestation, the oropharyngeal membrane will break down, allowing communication of the foregut with the oral cavity. Of the following structures in the adult, which one lies at the same location as the embryonic oropharyngeal membrane?
Answer(s): B
The palatoglossus muscle, which can be observed in the oral cavity to form the palatoglossal arch anterior to the palatine tonsil, lies in the same location as the embryonic oropharyngeal membrane. It lies at the junction line between the stomodeum and the foregut. The buccinator (choice A) is a muscle of the cheek and thus is located in the original stomodeum. The palatopharyngeus (choice C) is located posterior to the palatoglossus and palatine tonsil, forming the palatopharyngeal arch. The palatopharyngeus, stylopharyngeus (choice D), and superior constrictor (choice E) muscles are all pharyngeal muscles and thus are located in the original foregut.
Referring to following figure, arrow 2 indicates which of the following structures?
The intercalated disks are specialized junctional complexes found only in cardiac muscle and they appear as dark lines between the muscle fibers. The motor end-plate (choice B) is a specialized group of synapses between the axon terminals of a motor neuron and the sarcolemma of a skeletal muscle fiber. It is not seen in cardiac muscle. The sarcoplasmic reticulum (choice C) is a specialized modification of the smooth endoplasmic reticulum for sequestering calcium ions. The transverse tubule or T tubule (choice E) is an invagination of the sarcolemma, which penetrates the muscle fiber and overlies the surface of the myofibrils. The sarcoplasmic reticulum and T tubule can only be seen in electron micrographs. There is no tendinous junction (choice D) in cardiac muscle.
Share your comments for USMLE STEP1 exam with other users:
question 13 should be dhcp option 43, right?
the buy 1 get 1 is a great deal. so far i have only gone over exam. it looks promissing. i report back once i write my exam.
is this dump good
good ................
passed
yes going good
good questions for practice
need dump and sap notes for c_s4cpr_2308 - sap certified application associate - sap s/4hana cloud, public edition - sourcing and procurement
question 11: d i personally feel some answers are wrong.
nice questions
looking for c1000-158: ibm cloud technical advocate v4 questions
can you share the pdf
admin ii is real technical stuff
could you post the link
hello send me dumps
it is very nice
i gave the amazon dva-c02 tests today and passed. very helpful.
there is an incorrect word in the problem statement. for example, in question 1, there is the word "speci c". this is "specific. in the other question, there is the word "noti cation". this is "notification. these mistakes make this site difficult for me to use.
passed my az-120 certification exam today with 90% marks. studied using the dumps highly recommended to all.
i need it, plz make it available
q47: intrusion prevention system is the correct answer, not patch management. by definition, there are no patches available for a zero-day vulnerability. the way to prevent an attacker from exploiting a zero-day vulnerability is to use an ips.
this is simple but tiugh as well
questão 4, segundo meu compilador local e o site https://www.jdoodle.com/online-java-compiler/, a resposta correta é "c" !
its very useful
i mastered my skills and aced the comptia 220-1102 exam with a score of 920/1000. i give the credit to for my success.
real questions
very helpful assessments
hi there, i would like to get dumps for this exam
i studied for the microsoft azure az-204 exam through it has 100% real questions available for practice along with various mock tests. i scored 900/1000.
please upload 1z0-1072-23 exam dups
i was hoping if you could please share the pdf as i’m currently preparing to give the exam.
i am looking for oracle 1z0-116 exam
where we can get the answer to the questions