Understanding Marathon Running and Fish Breathing

The video discusses Eliud Kipchoge's record-breaking marathon run and compares human and fish breathing efficiency. It explains the structure and function of fish gills, highlighting their ability to absorb oxygen efficiently through a counter-current system. The video also explores how fish adapt to low oxygen environments, including the use of lungs by some species like the Australian lungfish.

What was Eliud Kipchoge's marathon time in Vienna 2019?

• 2 hours, 1 minute, and 39 seconds

• 1 hour, 58 minutes, and 30 seconds

• 1 hour, 59 minutes, and 40 seconds

• 2 hours, 2 minutes, and 50 seconds

What physiological trait helps elite runners like Eliud Kipchoge?

• Higher muscle mass

• Twice the oxygen intake as non-runners

• Faster heart rate

• Longer stride length

Why are fish considered more efficient breathers than humans?

• They have a higher heart rate

• They breathe less frequently

• They can extract more oxygen from water

• They have larger lungs

What is the primary organ fish use for breathing?

• Lungs

• Skin

• Gills

• Fins

What role do gill lamellae play in fish breathing?

• They produce carbon dioxide

• They filter water

• They increase the gill's surface area

• They store oxygen

How much oxygen can fish gills absorb from water?

• 50%

• 60%

• 75%

• 90%

What is a counter-current system in fish gills?

• Water and blood flow in the same direction

• Water and blood flow in opposite directions

• Blood flows faster than water

• Water flows faster than blood

How do fish living in deep waters adapt to low oxygen levels?

• By moving to shallower waters

• By reducing their size

• By increasing gill ventilation

• By developing larger gills

What unique adaptation does the Australian lungfish have?

• It can change color

• It has both gills and lungs

• It can fly

• It can live without water

Why do most fish not need extreme adaptations like the lungfish?

• They have more efficient hearts

• They live in oxygen-rich environments

• They have larger bodies

• They are faster swimmers