GASEOUS EXCHANGE

In the blood, most of the oxygen that will be used in cellular respiration is carried from the lungs to the body tissues

• as bicarbonate ions

• as haemoglobin

• as oxyhaemoglobin

• as carbaminohaemoglobin

How is most of the carbon dioxide transported by the blood in humans?

• bicarbonate ions in the plasma.

• CO₂ attached to hemoglobin

• carbonic acid in the red blood cell

• CO₂ dissolved in the plasma

The Bohr shift on the oxygen dissociation curve is produced by changes in___________ blood

• the partial pressure of oxygen and carbon monoxide

• body temperature

• haemoglobin concentration

• pH

What is H₂CO₃ ?

Which of the following is FALSE concerning the hemoglobin molecule?

• It's composed amino acid as monomer

• It is composed of 4 polypeptide chains and can bind with 4 O₂ molecules

• It is a tertiary structure

• It is found in red blood cells

Hydrogen ions produced in human red blood cells are prevented from significantly lowering pH by combining with

• haemoglobin

• plasma protein

• blood plasma

• bicarbonate ion

Which of the following factors is the most effective in increasing the rate of breathing in a mammal?

• concentration of O₂ in the alveoli increase

• concentration of CO₂ in the alveoli increase

• concentration of CO₂ in the blood increase

• concentration of O₂ in the blood increase

Respiratory center is located in

• hypothalamus

• medulla oblongata

• pons

• cerebrum

What causes oxygen dissociation curve of hemoglobin is shift to the right?

• increase in concentration of oxygen

• increase in blood pH

• increase in concentration of carbon dioxide

• decrease in blood pH

Oxygen dissociation curve of myoglobin is located on the left of hemoglobin because

• Myoglobin has higher affinity to O₂ even at low concentration of CO₂

• Myoglobin has lower affinity to O₂ even at low concentration of O₂

• Myoglobin has higher affinity to O₂ at high concentration of CO₂

• Myoglobin has higher affinity to O₂ even at low concentration of O₂