biology zoology blog benno meyer rochow claws

Locked in, Locked up, Locked on…

Something that’s difficult to open

You can lock arms with someone, you can lock on to something or be locked in or even be locked up or locked out. But this essay is about animals that possess locking mechanisms. In the tropical waters of Ascension Island in the South Atlantic Ocean, for example, I once caught a pair of matchbox-sized trigger fish and observed their behaviour in my aquarium on board of the research vessel “Walter Herwig”. These denizens of the tropical seas as well as their cousins, the file fishes, can wedge themselves into rock cracks and coral crevices in such a way that it is virtually impossible to dislodge them by pulling at their tails. —>—>

exercise muscle anatomy fibers

Exercise – how does it strengthen the muscle ?

The white and red fibres

There are those who like only breasts and those who prefer legs. I’m a leg person, but tastes are known to differ. Why? Breast and leg musculature (I’m talking of the chicken, of course) serve different purposes and, containing different chemicals, also taste differently. Legs, ready for sudden bursts of activity, are “run” by so-called fast, white muscles, which are loaded with glycogen (a carbohydrate) as the main fuel. White muscle fatigues easily, but it has a sweetish taste. Postural muscles like those of the chicken breast and flight muscles in migratory birds on the other hand are designed for long, sustained activities and termed red (or slow) musculature. The do not fatigue easily and contain the reddish myoglobin to supply them with oxygen and nutrients. Continue reading