The sphincter that separates the ileum and the cecum is the ________
A) lower esophageal sphincter
B) ileocecal sphincter
C) pyloric sphincter
D) anal sphincter
B
Explanation:
A) The lower esophageal sphincter separates the esophagus and the stomach.
C) The pyloric sphincter separates the stomach and the duodenum.
D) The anal sphincter is located at the end of the anal canal and regulates the passage of feces out of the rectum.
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Which of the following are examples of neuroeffector synapses?
A) neuroneural synapse B) neuromuscular synapse C) neuroglandular synapse D) neuroaxonic synapses E) both neuromuscular synapse and neuroglandular synapse
A 58-year-old man is presented with edema of the lower limb and enlarged superficial veins of the abdominal wall. Examination of radiographs and angiograms reveals obstruction of the IVC just proximal to the entrance of the renal vein. This venous blockage may result in dilation of which of the following veins?
(A) Left suprarenal vein (B) Right inferior phrenic vein (C) Right hepatic vein (D) Left gastric vein (E) Portal vein
Alternative routes of blood supply are called ________.
A. anastomoses B. capillary beds C. thoroughfare channels D. metarterioles E. preferred channels
The type of muscle fibers that have only a single nucleus, both thick and thin filaments, but no Z discs, are
A. cardiac. B. smooth. C. skeletal. D. cardiac and skeletal. E. cardiac and smooth.