Fish Physiology and Adaptations

The video discusses fish as ectothermic animals whose body temperature changes with water temperature. It explains the physiological adaptations of fish, including osmoregulation, which allows them to live in different salinities. Fish have internal organs similar to mammals but use gills for respiration, absorbing oxygen from water. The video also highlights the ability of fish and amphibians to live submerged in water.

What does it mean for fish to be ectothermic?

• They have a constant body temperature.

• They can survive in both hot and cold climates.

• Their body temperature changes with the water temperature.

• They generate their own body heat.

Why are most fish species in Texas considered warm water fish?

• Because Texas is close to the North Pole.

• Because Texas has a cold climate.

• Because Texas waters are generally warm.

• Because fish in Texas have adapted to cold water.

Which organ in fish is responsible for pumping blood?

• Liver

• Kidneys

• Heart

• Gills

What is osmoregulation in fish?

• The process of breathing underwater.

• The process of digestion in fish.

• The regulation of salt and water intake.

• The ability to change body temperature.

How do fish in saltwater environments manage their salt levels?

• By absorbing salt through their skin.

• By drinking large amounts of freshwater.

• By excreting large amounts of salt through their gills.

• By avoiding saltwater altogether.

What are euryhaline species?

• Species that can adapt to a wide range of salinities.

• Species that can only live in saltwater.

• Species that cannot survive in brackish water.

• Species that can only live in freshwater.

What adaptation allows fish to breathe underwater?

• Scales

• Lungs

• Gills

• Fins

How do gills function in fish?

• They regulate the fish's body temperature.

• They help fish to swim faster.

• They absorb dissolved oxygen and release carbon dioxide.

• They pump blood throughout the body.

What is a unique feature of fish compared to humans?

• They have lungs.

• They have gills instead of lungs.

• They have a constant body temperature.

• They can walk on land.

Which vertebrates can live their entire lives submerged in water?

• Only fish

• Only amphibians

• Fish and amphibians

• Mammals and birds