UNIT 1 Topic 6: Gas exchange & transport

Which of the following does not accurately describe a component of the blood?

• Plasma transports body heat, nutrient and hormones around the body.

• White blood cells, also called leukocytes, function to protect the body against invaders.

• Red blood cells can bind to and carry oxygen molecules, but not carbon dioxide.

• Platelets are fragments of larger cells in bone marrow that initiate blood clotting.

Which of the following statements correctly describes the role of blood components in transport?

• When there is a high concentration of oxygen, as in the capillaries exiting the lungs, the oxygen dissociates from haemoglobin to form oxyhaemoglobin.

• The pH of the plasma varies significantly, depending on the uptake of materials from the digestive tract.

• Where there is a low concentration of oxygen, as in the tissues, the oxygen molecules combine with the haemglobin to form oxyhaemoglobin.

• Carbon dioxide is carried dissolved in the plasma, or it may react with water to form carbonic acid.

Which of the following combinations correctly lists adaptations for efficient gaseous exchange surfaces?

• Thin membrane surface, well protected, enzyme controlled reactions.

• Good blood supply, moist, large surface area.

• Moist surroundings, thin membrane surface, active transport.

• Large surface area, well protected, enzyme controlled reactions.

Tags

NGSS.HS-LS4-4

To ensure efficient gaseous exchange, the lungs and tissues have:

• Large concentration gradient.

• No distinguishable concentration gradient.

• A highly efficient active transport system.

• more solutes than solvents.

Tags

NGSS.HS-LS2-5

When atmospheric gases are inhaled, the gases will pass into the body through the following body parts (in the correct order):

• Mouth, pharynx, trachea, alveoli, bronchi.

• Pharynx, larynx, bronchioli, trachea, alveoli.

• Nasal cavity, pharynx, larynx, trachea, bronchi, alveoli.

• Stoma, larynx, bronchioli, alveoli, infundibulum.