AMC MCQ PRACTICE TEST

Question 1

Which of the following mammalian cells is unable to aerobically metabolize glucose to carbon dioxide?

Accepted Answer

RBC

Answer

Red blood cells are not capable of metabolizing glucose to carbon dioxide aerobically. They contain
 hemoglobin pigment.

Question 2

True or False: Respiration is a physical process and depends on the principle of diffusion.

Accepted Answer

A) False

Answer

Respiration is a complex biological process that involves both physical gas exchange and biochemical reactions. While the gas exchange aspect (external respiration) relies on the physical principle of diffusion, cellular respiration is a metabolic pathway involving a series of enzymatic reactions to produce ATP. Therefore, stating it is *solely* a physical process dependent *only* on diffusion is incorrect.

Question 3

True or False: A person can expel all the air from the lungs.

Accepted Answer

A) False

Answer

It is physiologically impossible to expel all the air from the lungs. Even after the most forceful exhalation, a volume of air known as the residual volume always remains in the lungs. This residual air prevents the collapse of the alveoli and ensures continuous gas exchange between breaths.

Question 4

The larger part of carbon dioxide created by the body is transported to lungs _______

Accepted Answer

As carbonates

Answer

The vast majority of carbon dioxide produced by the body is transported to the lungs in the form of bicarbonate ions (HCO3-). CO2 diffuses into red blood cells, where it is converted to carbonic acid and then dissociates into bicarbonate and hydrogen ions. This allows for efficient CO2 transport and helps regulate blood pH.

Question 5

The diaphragm _______ during inspiration.

Accepted Answer

Contracts

Answer

During inspiration (inhalation), the diaphragm contracts and flattens, moving downwards. This action increases the volume of the thoracic cavity, which in turn decreases the pressure within the lungs. The resulting pressure gradient causes air to flow into the lungs.

AMC MCQ Practice Test

AMC MCQ Practice Test

AMC MCQ PRACTICE TEST