The fact that most of us have five lumbar vertebrae, but some people have six and some have four, is an example of __________ variation among organisms.
A. cellular
B. holistic
C. physiological
D. anatomical
E. reductionist
D. anatomical
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Which brain areas lack a blood-brain barrier, and what purpose does this absence serve?
What will be an ideal response
In a condition known as endometriosis, endometrial cells are present in the uterine tubes and/or in the peritoneal cavity where they become established tissues. A major symptom of endometriosis is periodic pain. Why do you think this occurs?
What will be an ideal response?
A patient is rushed to the operating room for an emergent cholecystectomy (resection of a gallbladder) because of cholecystitis. While locating landmarks before surgical resection of an infected gallbladder, the surgeon recalls a portal-caval anastomosis. Which of the following pairs of veins form a portal-caval anastomosis?
(A) Hepatic veins and IVC (B) Superior and middle rectal vein (C) Left and right gastric vein (D) Inferior and superficial epigastric veins (E) Suprarenal and renal veins
Geri has pain behind her ear lobe and was diagnosed with mastoiditis. Which bone is affected?
A) occipital bone B) mandible C) temporal bone D) frontal bone