Physiological Adaptations of Seals

The video explains how Atlantic Gray Seals dive deep and stay underwater for extended periods. Seals expel air before diving to reduce buoyancy and store oxygen in their blood, which is richer in oxygen-carrying cells than human blood. They can shut off blood supply to non-essential organs, slowing their heartbeat to conserve oxygen. Seals also use cold water to cool their brains, reducing oxygen needs.

How deep can the Atlantic Gray Seal dive?

• 500 meters

• 200 meters

• 1500 meters

• 1000 meters

What does the seal do before diving to reduce buoyancy?

• Takes a deep breath

• Inhales more oxygen

• Holds its breath

• Exhales air

How does the seal's blood differ from human blood?

• It is thinner

• It has fewer blood cells

• It is twice as thick

• It carries less oxygen

What is the primary function of the seal's thick blood?

• To reduce body temperature

• To store more oxygen

• To speed up metabolism

• To increase buoyancy

What happens to the seal's heart rate during a dive?

• It increases to 150 beats per minute

• It slows to 5 beats per minute

• It remains constant

• It stops completely

Why does the seal shut off blood supply to certain body parts?

• To conserve energy

• To maintain oxygen flow to vital organs

• To increase speed

• To reduce body temperature

How does the seal use cold water to its advantage?

• By reducing its heart rate

• By cooling its brain

• By increasing its body temperature

• By speeding up its metabolism

What is the benefit of a cooler brain for the seal?

• It requires less oxygen

• It increases alertness

• It speeds up thinking

• It enhances memory