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31 Jan 2019

The distention of the stomach by food is the primary stimulus to begin the

Select one:

a. cephalic phase of gastric secretion.

b. gastric phase of gastric secretion.

c. intestinal phase of gastric secretion.

d. cystic phase of gastric secretion.

e. hepatic phase of gastric secretion.

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Related questions

True or false

a.) Sow bugs belong to the class Malacostraca, which also includes lobster, crabs and shrimp.

b.) Crustaceans have well-developed sense organs tincluding tactile hairs, which are delicate projections of cuticle distributed over the body but especially on the mouthparts, chelae, and telson.

c.) In crayfishes, the first part of the stomach contains a gastric mill in which food, already shred by their chelipeds can be further ground by three calcareous teeth into particles fine enough to pass through a filter of setae in the second part of the stomach.

1. The site of implantation of a fertilized ovum is

A.The uterus
B.. The ovaries
C. The vag ina
D. The cervix

2. Which statement correctly describes the secretory phase of the uterine (menstrual) cycle?

A. Follicle stimulating hormone stimulates proliferation of the endometrium
B. During this phase, the endometrium detaches and sheds
C. Progesterone stimulates the endometrium to prepare for implantation
D. Decreased progesterone levels cause the endometrial cells to die

Which events in the monthly female reproductive cycle occur simultaneously?

A. Menstruation and the estrogen surge
B. Endometrial proliferation and development of the vesicular follicle
C. Degeneration of the corpus luteum and increased LH and FSH secretion
D. The secretory phase in the uterus and decreased progesterone levels

Please give some explanations, thanks.

It’s Friday morning and Sal Volpe is sitting in Dr. Lorraine’s exam room, dozing after another night of disrupted sleep. When the doctor knocks and walks in, she finds the 66-year-old man looking exhausted and uncomfortable. Sal gets to the reason for his visit immediately: He’s been suffering from “stomach aches” (dyspepsia) that wake him at night and nag him in between meals during the day. He describes his pain as gnawing, burning (maybe a 4 out of 10 on a pain scale) and points to the epigastric region of his abdomen. When he eats, he tells Dr. Lorraine, the pain goes away, but then he feels bloated and a little nauseated. The pain usually returns 2–4 hours later, depending on what he eats. Sal explains that he has had some pain relief from the over-the-counter drug Pepcid® (famotadine).

Dr. Lorraine proceeds with the history and physical exam. She discovers that Sal has a family history for gastrointestinal cancer and has unintentionally lost 10 pounds since his checkup a year ago. His epigastric area is modestly tender to palpation. She suspects a peptic ulcer (gastric or duodenal), but the weight loss and family history make it prudent to eliminate the diagnosis of stomach (gastric) cancer. “Mr. Volpe, I think you may have a stomach or intestinal ulcer,” Dr. Lorraine says. “I suggest we perform an endoscopy to have a look. This involves passing a small tube with a small camera through your mouth and into your stomach. We can look at the wall of your stomach and small intestine, check for an ulcer, and remove a very small piece of tissue to test for infection. We call this a biopsy. We’ll also test the biopsy for cancer because of your family history. But, I really think we’re dealing with an ulcer here and not cancer.”

Later that month, the endoscopy is performed and it confirms Dr. Lorraine’s suspicions. Sal has a duodenal ulcer and infection with the bacterium Helicobacter pylori (H. pylori). This is not surprising since H. pylori is the cause of most peptic ulcer disease, particularly in the duodenum. Treatment involves complete eradication of the H. pylori with two different antibiotics, and a drug that decreases gastric acid secretion, a so-called proton pump inhibitor (PPI). Dr. Lorraine explains to Sal, “Mr. Volpe, you do not have stomach cancer, but you do have a duodenal ulcer caused by the H. pylori bacteria I was telling you about. Too much acid and inflammation from this infection is causing your pain. The good news is we can probably cure your ulcer by killing the bacteria, but you will have to take three different medications twice a day for 14 days. I’ll see you again in 3 weeks; we can do a simple breath test to determine if the H. pylori has been successfully eliminated.”

Short Answer Questions:

The structures in the epigastric region share a common nerve supply. Can you name the specific cranial nerve that serves this region and the part of the nervous system to which it belongs?

In order to understand the disease in Mr. Volpe’s alimentary canal, one must know the layers that make up its walls. Design a chart that identifies the four basic layers of the alimentary canal, the tissues that make up each layer, and the general function of each layer.

Dr. Lorraine suspects a peptic ulcer. This is an inflammatory lesion in the stomach or duodenal mucosa, which may extend through all layers of the alimentary canal wall. Describe the basic histological (tissue) structure of the mucosa layer in the alimentary canal. Identify the unique features of the mucosa in the stomach and in the duodenum, and explain how this uniqueness determines the function of the stomach and the duodenum.

Mr. Volpe asks, “What do the bacteria have to do with the ulcer?” Dr. Lorraine tells him that the H. pylori increases stomach acid secretion and, at the same time, breaks down the lining of your stomach and duodenum. What is the source and normal function of acid in the stomach and what regulates its production

Why is Mr. Volpe’s dyspepsia relieved by food, and aggravated 2–4 hours after a meal?

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