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3اسئلة بايولوجي المرحلة الاولى

1-The function(s) of the digestive system is/are to

                A)           ingest food.

                B)            digest food into small nutrient molecules that can pass through cell membranes.

                C)            absorb nutrient molecules.

                D)           eliminate indigestible remains.

                E)            All of the choices are correct.

                               

2-The following is not considered an accessory organ of the digestive system:

                A)           liver

                B)            salivary glands

                C)            stomach

                D)           pancreas

                E)            gall bladder

                               

3-Children have __ deciduous teeth and adults have ___ permanent teeth.

                A)           15; 30

                B)            24; 36

                C)            20; 32

                D)           32; 36

                E)            18; 32

                               

4-The folds in the stomach are called

                A)           crypts.

                B)            lumens.

                C)            polyps.

                D)           rugae.

                E)            diverticula.

                               

5-The preferred energy source of the body is

                A)           carbohydrates.

                B)            proteins.

                C)            fats.

                D)           lipids.

                               

6-The ________ is a worm-shaped structure projecting from the right side of the large intestine.

                A)           cecum

                B)            appendix

                C)            duodenum

                D)           colon

                               

7-The layers of the gastrointestinal tract wall from the inside in order are:

                A)           submucosa, muscularis, mucosa, serosa

                B)            serosa, submucosa, muscularis, mucosa

                C)            mucosa, submucosa, muscularis, serosa

                D)           muscularis, serosa mucosa, submucosa

                               

8-The crown of a tooth is comprised of the following:

                A)           enamel

                B)            dentin

                C)            pulp

                D)           enamel, dentin, and pulp

                               

9-Swallowing is a ___________ that occurs in the ____________ and includes the closing off of the nasopharynx by the _____________.

                A)           voluntary action; larynx; Adam's apple

                B)            reflex action; pharynx; soft palate

                C)            voluntary action; mouth; epiglottis

                D)           reflex action; soft palate; glottis

                               

10-________ is the rhythmic contractions of smooth muscle that pushes food through the intestines.

                A)           Compaction

                B)            Peristalsis

                C)            Segmentation

                D)           Constipation

                               

11-In the stomach, HCl in gastric juice

                A)           kills bacteria.

                B)            breaks down the connective tissue of meat.

                C)            activates pepsin.

                D)           All of the choices are correct.

                               

12-When food leaves the stomach it appears as a thick, soup liquid called

                A)           bolus.

                B)            pepsin.

                C)            amylase.

                D)           chyme.

                               

13-The wall of the small intestine contains fingerlike projections called ______ that serve to increase surface area for absorption.

                A)           extensions

                B)            flagella

                C)            reticula

                D)           villi

                               

14-Pancreatic juice contains_________ that functions to neutralize acidic chyme from the stomach.

                A)           NaOH

                B)            Ca3(PO4)2

                C)            NaHCO3

                D)           NaCl

                               

15-The duodenal wall of the small intestine secretes

                A)           secretin.

                B)            cholecystokinin (CCK).

                C)            gastrin.

                D)           secretin and cholecystokinin.

                               

16-Hepatitis A is usually acquired from

                A)           sewage-contaminated food and drinking water.

                B)            the air.

                C)            contact with infected blood.

                D)           contact with body fluids.

                               

17-The portions of the large intestine include the:

                A)           colon

                B)            cecum

                C)            rectum

                D)           colon, cecum, rectum, and anus

                               

18-The large intestine absorbs

                A)           alcohol and water.

                B)            water and some vitamins.

                C)            bacteria and vitamins.

                D)           most nutrients important to maintaining homeostasis.

                               

19-To reduce dietary cholesterol, which of the following is recommended?

                A)           Avoid cheese, eggs, and liver.

                B)            Substitute egg whites for egg yolks.

                C)            Include oat bran, and fruits high in fiber.

                D)           All of the choices are recommended.

                               

20-Vitamins often form

                A)           coenzymes.

                B)            structural carbohydrates.

                C)            antioxidants.

                D)           coenzymes and antioxidants.

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