BIO 161 - Exam 3

Select all components of the cardiovascular system.

• Kidneys

• Blood vessels

• Spleen

• Heart

• Lungs

Select all events that are expected to occur when someone hyperventilates.

• Dizziness may occur.

• Buffers compensate for the low pH.

• Acidosis occurs.

• Breathing becomes inhibited.

• The blood has fewer hydrogen ions.

What is the function of carbonic anhydrase in respiration?

• It catalyzes the breakdown of hemoglobin in red blood cells.

• It catalyzes the transfer of oxygen from the lungs to the plasma.

• It catalyzes the breakdown of carbonic acid in red blood cells.

• It catalyzes the breakdown of oxygen in the plasma.

True or false: Most of the CO2 in the blood is transported as carbaminohemoglobin.

• True

• False

The breakdown of carbonic acid to form bicarbonate ions occurs in the ______.

• Blood plasma

• Platelets

• Tissue cells

• Tissue fluid

• Red blood cells

Which of the following are formed during the dissociation of carbonic acid as it occurs in the tissue capillaries?

• Water

• Hydrogen ions

• Carbon dioxide

• Bicarbonate ions

Within red blood cells, the breakdown of carbonic acid to bicarbonate produces excess hydrogen ions, which are then taken up by the globin portion of hemoglobin, forming _______ hemoglobin.

The breakdown of carbonic acid to form bicarbonate ions occurs in the ______.

• Red blood cells

• Tissue cells

• Blood plasma

• Platelets

• Tissue fluid

Which of the following conditions facilitates the diffusion of oxygen into the blood cells of the lungs?

• Alveolar air contains a higher partial pressure of oxygen.

• Blood in pulmonary capillaries is high in oxygen.

• Blood in pulmonary capillaries is low in oxygen.

How is the majority of carbon dioxide carried in the blood?

• As CO2 dissolved in the plasma.

• As bicarbonate ion in the blood plasma.

• In the cytoplasm of red blood cells.

• Combined with hemoglobin.