Author Question: After the cell has produced all substances necessary for the formation of a new cell, mitosis occurs ... (Read 105 times)

tth · **on:** Jul 23, 2018

After the cell has produced all substances necessary for the formation of a new cell, mitosis occurs in what phase of the cell cycle?

A) G0 phase
B) M phase
C) S phase
D) G2 phase

Question 2

A patient presents at the walk-in clinic complaining of stomach pain that is relieved by eating which the nurse suspects is caused by a peptic ulcer. How would the nurse explain the ulceration in the stomach to the patient?

A) A mucosal lining protects the stomach from hydrochloric acid and a reduction in the mucosal lining or increase in acid production allows peptic ulcers to develop.
B) After digesting food, the stomach secretes a neutralizing solution to make the pH of the stomach neutral and if this doesn't occur peptic ulcers can develop.
C) Our body makes hydrochloric acid for the digestion of the food we eat and that can eat right through the stomach causing ulceration when you eat a diet high in spicy food.
D) Acid is secreted by cells in the first part of the small intestine and when we eat the acid flows into the stomach so people who eat often have more exposure to acid.

SVictor · **Reply #1 on:** Jul 23, 2018

Answer to Question 1

B
Feedback:
After the cell has produced all substances necessary for formation of a new cell, or daughter cell, it undergoes cell division. This occurs during the M phase of the cell cycle. During this phase, the cell splits to form two identical daughter cells, a process called mitosis. The S phase involves the actual synthesis of DNA. In the G2 phase, the cell produces all the substances required for manufacture of the mitotic spindles.

Answer to Question 2

A
Feedback:
Gastrin and the parasympathetic system stimulate histamine-2 receptors near the parietal cells, causing the cells to release hydrochloric acid into the lumen of the stomach. Other digestive enzymes are released appropriately, in response to proteins and carbohydrates, to begin digestion. Peptic ulcers can develop when there is a decrease in the protective mucosal layer or an increase in acid production. Research indicates that people who eat a spicy diet everyday are less prone to stomach ulceration; the stomach does not neutralize the hydrochloric acid but the highly alkaline duodenum neutralizes the pH when chyme arrives from the stomach. Acid does not flow from the small intestine to the stomach.