Q: Which of the following is the correct formula for calculating partial pressure of a gas in a mixture according to Dalton's Law?

$$P_{gas} = F_{gas} \times P_{total}$$

Question 1

Which of the following best describes the process by which oxygen is transported in the blood from the lungs to the tissues?

Accepted Answer

Oxygen binds reversibly to hemoglobin, forming oxyhemoglobin, which transports it to tissues.

Question 2

Which of the following factors, when increased, results in a decrease of hemoglobin's affinity for oxygen (thus enhancing oxygen unloading from the blood)?

Accepted Answer

Increased $$\mathrm{H^+}$$ concentration

Question 3

A patient is experiencing difficulty breathing due to a lack of surfactant in the alveoli. What is the primary function of surfactant in the respiratory system?

Accepted Answer

Surfactant decreases surface tension, preventing alveolar collapse.

Question 4

During inspiration, which of the following events occurs to allow air to enter the lungs?

Accepted Answer

The external intercostal muscles contract, increasing thoracic volume.

Question 5

Which law explains the relationship between the volume and pressure of a gas in the lungs during breathing?

Accepted Answer

Boyle's Law: $$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$

Question 6

A patient has a partial pressure of oxygen ($$P_{O_2$}) in $$the alveoli that is lower than normal. Which of the following is the most likely cause?

Accepted Answer

Decreased alveolar ventilation

Question 7

Which of the following is NOT a structural modification found in the small intestine to increase surface area for nutrient absorption?

Accepted Answer

Rugae

Question 8

Which of the following best describes the role of bile in digestion?

Accepted Answer

Bile emulsifies fats, increasing their surface area for enzyme action.

Question 9

Which enzyme is responsible for the breakdown of starch into maltose in the digestive tract?

Accepted Answer

Amylase

Question 10

A patient is unable to digest fats properly due to a deficiency in a specific biological molecule. Which molecule is most likely deficient?

Accepted Answer

Bile salts

Question 11

Which of the following is the correct sequence of layers in the wall of the gastrointestinal tract from innermost to outermost?

Accepted Answer

Mucosa, submucosa, muscularis, serosa

Question 12

Which of the following is a correct description of the function of the large intestine?

Accepted Answer

Absorption of water and electrolytes

Question 13

Which of the following best explains the effect of increased $$\mathrm{CO_2$}$$ concentration on blood pH?

Accepted Answer

Blood pH decreases due to increased formation of carbonic acid.

Question 14

Which of the following is the correct formula for calculating partial pressure of a gas in a mixture according to Dalton's Law?

Accepted Answer

$$P_{gas} = F_{gas} 	imes P_{total}$$

Question 15

A patient with a gastric ulcer has damage to which layer of the stomach wall?

Accepted Answer

Mucosa

Question 16

Which of the following is a function of the accessory digestive organs?

Accepted Answer

Production of enzymes and bile for digestion

Question 17

Which of the following is the correct order of the three parts of the pharynx from superior to inferior?

Accepted Answer

Nasopharynx, oropharynx, laryngopharynx

Question 18

Which of the following best describes the process of peristalsis in the digestive tract?

Accepted Answer

Rhythmic contraction and relaxation of smooth muscle to propel food forward

Question 19

Which of the following is the correct formula for calculating tidal volume ($$V_T) if $$the minute ventilation ($$V_E) $$and respiratory rate ($$f) $$are known?

Accepted Answer

$$V_T = V_E \div f$$

Question 20

Which of the following statements about the movement of oxygen and carbon dioxide across the respiratory membrane is correct?

Accepted Answer

Oxygen moves from the alveoli into the blood due to a partial pressure gradient.

Respiratory and Digestive Systems: Study Guide Notes

Guida di studio - Domande di pratica

Study guide - Flashcard