BIO 225: Final Lab Exam
Which cell of the gastric glands produces pepsinogen?
Chief cell
Gastric secretion is increased in all three phases (cephalic, gastric, intestinal). True or False
False
The stomach is located in which abdominal quadrant?
Left upper
Which type of cell is responsible for HCl production in the stomach?
Parietal cells
Which ions are counter transported back into the parietal cells as the hydrogen ions are transported out into the gastric juice?
Potassium ions
From external to internal, what is the correct order of layers of the stomach?
Serosa, muscularis, submucosa, mucosa
How do chloride ions that are used to make HCl enter parietal cells?
They are transported into parietal cells from the blood stream in exchange for bicarbonate ions.
Klinefelter syndrome
XXY, people with this disorder have male sex organs, but the testes are abnormally small and the man is sterile with low testosterone
Which phases of gastric secretion are regulated by the medulla oblongata?
all 3 (cephalic, gastric, intestinal)
Bicarbonate ions formed during the dissociation of carbonic acid...
are transported back into the blood stream
Which of the following is not secreted by the stomach to aid in digestion? a. HCl b. Bile c. Pepsinogen d. Regulatory hormone
b. bile
Which of the following is not a function of the digestive system? a. waste elimination b. production of ATP c. nutrient absorption d. mechanical digestion
b. production of ATP
Which of the following might stimulate the cephalic phase of gastric secretion? a. stomach distention b. the thought of food c. the produciton of saliva d. the produciton and secretion of gastrin
b. the thought of food
How can hCG increase test?
can act like LH and stimulate leydig cells to secrete test
How can having mumps after puberty affect a male?
can cause sterility
Which region of the stomach is continuous with the esophagus?
cardiac region
What are the 3 phases of gastric secretion?
cephalic, gastric, intestinal
Functions of the stomach include...
chemical and mechanical digestion
Bile from the liver and digestive juices from the pancreas enter which section of the small intestine?
duodenum
Which cells does LH affect in males?
interstitial cells of Leydig
Digestion begins in the....
mouth
What do high LH levels and low test levels indicate?
obesity chronic use of ETOH/marijuana viral orchitis
Gastric secretion during the intestinal phase is inhibited by the...
presence of lipids or low pH
What do low LH levels and low test levels indicate?
problem with anterior pituitary
During digestion the majore site of nutrient absorption is the...
small intestine
What is the normal role of prolactin in men?
there is no known normal function in men
What molecule is the ultimate source of hydrogen ions that are secreted into the gastric juice?
water
How do marijuana and alcohol affect male sex hormone levels?
-causes low test and high LH because of reduced feedback inhibition from test
How can marijuana produce gynecomastia in males?
-due to phytoestrogens in plant -adipose tissue converts test to estrogen
What does inhibin do in males?
-inhibits FSH secretion -released by sertoli cells
How does obesity affect male sex hormone levels?
-sex hormone binding globulin is decreased in plasma -lowers total testosterone concentration even though free plasma test remains in normal range
