In which process do the germ layers differentiate into organs and organ systems?
Organogenesis
Embryogenesis
Gastrulation
Cleavage
Neurulation
The Correct Answer is A
A. Organogenesis: This is the process during which the three germ layers (ectoderm, mesoderm, endoderm) give rise to organs and organ systems.
B. Embryogenesis: Broad term that includes all development from fertilization to the fetal stage.
C. Gastrulation: Earlier stage in which the three germ layers form from the epiblast.
D. Cleavage: Series of mitotic divisions that create the blastocyst; occurs before germ layer formation.
E. Neurulation: This is a fundamental process in the early development of vertebrate embryos that establishes the central nervous system. It's the intricate series of events where a flat sheet of cells, the neural plate, folds and transforms into a hollow structure called the neural tube.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Seminal vesicle: Located posterior to the bladder; contributes fluid to semen but does not surround the urethra.
B. Urethra: The tube that passes through the prostate; not a gland itself.
C. Bulbourethral gland: Located below the prostate; much smaller in size.
D. Prostate: The prostate gland is about the size of a golf ball, located just below the bladder, and encircles the prostatic urethra.
E. Ejaculatory duct: Passes through the prostate but is not the structure described.
Correct Answer is B
Explanation
A. Nasal vestibule: The nasal vestibule is the anterior part of the nasal cavity just inside the nostrils, lined with skin and hair.
B. Nasal cavity: The nasal cavity is a large air-filled space behind the nose, extending from the nostrils to the choanae.
C. Nasal concha: The nasal conchae are curved bony projections (superior, middle, and inferior) inside the nasal cavity that increase the surface area for warming and humidifying air.
D. Sphenoid sinus: The sphenoid sinus is a hollow space within the sphenoid bone, located posterior to the nasal cavity and inferior to the sella turcica.
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