Gaseous exchange in human and animal

Most of the carbon dioxide produced by the body tissue is transported to the lungs in the form of …

• Carbonic acid.

• Blood plasma.

• Bicarbonate ion.

• Carbaminohaemoglobin.

Oxyhaemoglobin gives up O₂ when …

• CO₂ concentrations are high.

• Body temperature is lowered.

• pH values are high.

• O₂ concentrations are higher.

Tags

NGSS.HS-LS1-3

The acidity due to the accumulation of H⁺ in erythrocytes is buffered by …

• Haemoglobin.

• Plasma proteins.

• Carbon dioxide.

• Oxygen.

Carbonic anhydrase in the erythrocytes …

• Catalyzes the removal of oxygen from the erythrocytes.

• Catalyzes the conversion of carbon dioxide into water.

• Catalyzes the reaction of carbon dioxide with water to form carbonic acid.

• Catalyzes the increase in blood pH.

Each haemoglobin molecule can bind reversibly with

• one atom of oxygen

• one molecule of oxygen

• two molecules of oxygen

• four molecules of oxygen

The diaphragm is a dome-shaped skeletal muscle that forms the floor of the thoracic cavity.

• True

• False

A contraction of the diaphragm during inhalation causes it to flatten. What else does the contraction result in?

• An increase in the vertical diameter of the thoracic cavity
• Increase in alveolar pressure
• A decrease in lung volume
• A decrease in the vertical diameter of the thoracic cavity

What is the significance of counter current flow?

• It prevents blood and water from mixing

• To create a steeper concentration gradient

• To prevent Oxygen and Carbon (IV) oxide from mixing

• To remove Nitrogen gas

Which of the following is not true during inhalation?

• Diaphragm flattens

• External intercostal muscles contract

• Internal intercostal muscles relax

• Volume of thoracic cavity decreases

Which of the following is not true during exhalation?

• Diaphragm flattens

• External intercostal muscles relax

• Internal intercostal muscles contract

• Volume of thoracic cavity decreases