Gaseous RT MCAT

All of the following are correct about gas exchange in humans EXCEPT

• Hemoglobin carries oxygen and carbon dioxide in fairly equal amounts

• Breathing rate is regulated by the medulla of the brain

• The purpose of the nose is to filter, warm, and moisten air

• Gas exchange occurs in alveoli

• When carbon dioxide builds up in the blood, the pH lowers

Cartilage is not found in:

• Trachea

• Bronchioles

• Bronchi

• Larynx

Blood vessel carrying least CO2 is:

• Vena cava

• Hepatic vein

• Neutrophils

• Pulmonary artery

Photorespiration is the characteristic of

• CAM plants

• C3 plants

• C4 plants

• None of the above

Respiration in plants

• Occurs only during day

• Results in the formation of vitamins

• Is the characteristic of all living cells

• Often requires CO2

Which prevent trachea from collapsing

• Muscles

• Diaphragm

• Ribs

• Cartilaginous rings

Constant flow of C02 from the tissues into the blood is due to

• Less amount of C02 in tissue cells than in the blood

• More amount of C02 in tissue cells than in the blood

• Equal amount of CO2 in tissue cells and blood

• Enzymatic reactions

By which process gases are exchanged during respiration?

• Diffusion

• Active transpiration

• Osmosis

• All of them

Oxygen content is greater in

• Air

• Water

• Both a and b

• None of them

What is the main source of gaseous exchange in plants?

• Xylem vessels

• Stomata

• Phloem vessels

• All of them