Crossed-extensor reflex prevents you from falling when you suddenly lift one foot off the ground in response to pain.
- A withdrawal reflex is the crossed extensor reflex. In the withdrawing limb, the extensors relax while the flexors contract, but in the other limb, the opposite happens.
- This can be seen, for instance, when someone steps on a nail; the affected leg pulls away, while the other leg bears the weight of the entire body.
- Contralateral means that the crossed extensor reflex takes place on the side of the body that is opposite from the stimulus.
- Afferent nerve fiber branches travel from the stimulated side of the body to the opposite side of the spinal cord to cause this response.
- They make connections with interneurons there, which then stimulate or inhibit alpha motor neurons to he muscles of the contralateral limb.
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Answer:
Plucking and abrasion
Explanation:
Plucking is when the glacier picks something off the ground and moves it to another location.
Abrasion is the scraping of the ground by the glacier itself.
Enzymes are proteins, and proteins are basically a large chain of amino acids (polymer). So imagine when the chain is clumped into a 3D thing (see picture), it is slightly elastic (since there are spaces) and can have a bit of movement for the substrate to fit in. However, the shape is specific as it will return back to its original position once the substrate has left. Just imagine a silicone cup, when you stretch it a bit to fit a slightly larger ball in, it expands a little. When u remove the ball, it returns to its original shape. Similarly, the enzyme active site will return to its original shape but can be slightly molded for a short while, and that is what the sentence meant. It’s quite hard to explain without an actual model/ video, so if you don’t understand you can comment below!