While preparing a presentation on marine organisms in extreme environments, a student takes the following notes:
* The Antarctic icefish *Chaenocephalus aceratus* lacks hemoglobin, the oxygen-carrying protein found in the blood of most vertebrates.
* Because it lacks hemoglobin, the fish's blood is translucent and carries only about of the oxygen of typical red-blooded fish.
* To transport enough oxygen, *C. aceratus* has a heart that is three times larger relative to its body size than that of related red-blooded species.
* *C. aceratus* also has blood vessels with wide diameters, which reduces resistance to blood flow.
* These anatomical features allow *C. aceratus* to pump blood at a rate four times faster than related species with red blood.
The student wants to support the claim that *C. aceratus* has developed structural cardiovascular adaptations to offset the oxygen-carrying limitations of its blood. Which choice uses information from the notes to accomplish this goal?
- Because its hemoglobin-free blood carries significantly less oxygen than typical blood, *C. aceratus* relies on structural adaptations—a heart three times larger than that of related species and wide blood vessels—to pump blood four times faster.Cevap
- BThe blood of *C. aceratus* is translucent and carries only about of the oxygen found in typical red-blooded fish because the species lacks the oxygen-carrying protein hemoglobin.
- CBecause *C. aceratus* lacks hemoglobin and has blood that carries very little oxygen, it must inhabit the freezing, highly oxygenated waters of the Southern Ocean to survive.
- DTo offset its lack of hemoglobin, *C. aceratus* has a heart that is three times larger than that of any other marine vertebrate, allowing it to pump blood at a rate four times faster than related species.